diff --git a/CHANGELOG.md b/CHANGELOG.md
index 667fd3b2..e0c41d89 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - New method `Redmine\Api\User::list()` to list users.
 - New method `Redmine\Api\Version::listByProject()` to list versions from a project.
 - New method `Redmine\Api\Wiki::listByProject()` to list wiki pages from a project.
+- New exception `Redmine\Exception\UnexpectedResponseException` if the Redmine server responded with an unexpected body.
 
 ### Deprecated
 
diff --git a/src/Redmine/Api/CustomField.php b/src/Redmine/Api/CustomField.php
index 4282d925..e02395e9 100644
--- a/src/Redmine/Api/CustomField.php
+++ b/src/Redmine/Api/CustomField.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * Listing custom fields.
@@ -23,13 +24,17 @@ class CustomField extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of custom fields found
      */
     final public function list(array $params = []): array
     {
-        $this->customFields = $this->retrieveData('/custom_fields.json', $params);
+        try {
+            $this->customFields = $this->retrieveData('/custom_fields.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->customFields;
     }
@@ -56,6 +61,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Group.php b/src/Redmine/Api/Group.php
index 6bbfdc73..0598cfba 100644
--- a/src/Redmine/Api/Group.php
+++ b/src/Redmine/Api/Group.php
@@ -5,6 +5,7 @@
 use Redmine\Exception;
 use Redmine\Exception\MissingParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\PathSerializer;
 use Redmine\Serializer\XmlSerializer;
 
@@ -26,13 +27,17 @@ class Group extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of groups found
      */
     final public function list(array $params = []): array
     {
-        $this->groups = $this->retrieveData('/groups.json', $params);
+        try {
+            $this->groups = $this->retrieveData('/groups.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->groups;
     }
@@ -59,6 +64,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Issue.php b/src/Redmine/Api/Issue.php
index a9aae152..31f2b7a9 100644
--- a/src/Redmine/Api/Issue.php
+++ b/src/Redmine/Api/Issue.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\JsonSerializer;
 use Redmine\Serializer\PathSerializer;
 use Redmine\Serializer\XmlSerializer;
@@ -40,13 +41,17 @@ class Issue extends AbstractApi
      *
      * @param array $params the additional parameters (cf available $params above)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of issues found
      */
     final public function list(array $params = []): array
     {
-        return $this->retrieveData('/issues.json', $params);
+        try {
+            return $this->retrieveData('/issues.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
     }
 
     /**
@@ -81,6 +86,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/IssueCategory.php b/src/Redmine/Api/IssueCategory.php
index d4599970..cfb44618 100644
--- a/src/Redmine/Api/IssueCategory.php
+++ b/src/Redmine/Api/IssueCategory.php
@@ -6,6 +6,7 @@
 use Redmine\Exception\InvalidParameterException;
 use Redmine\Exception\MissingParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\PathSerializer;
 use Redmine\Serializer\XmlSerializer;
 
@@ -29,7 +30,7 @@ class IssueCategory extends AbstractApi
      * @param array      $params            optional parameters to be passed to the api (offset, limit, ...)
      *
      * @throws InvalidParameterException if $projectIdentifier is not of type int or string
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of issue categories found
      */
@@ -42,7 +43,11 @@ final public function listByProject($projectIdentifier, array $params = []): arr
             ));
         }
 
-        $this->issueCategories = $this->retrieveData('/projects/'.strval($projectIdentifier).'/issue_categories.json', $params);
+        try {
+            $this->issueCategories = $this->retrieveData('/projects/'.strval($projectIdentifier).'/issue_categories.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->issueCategories;
     }
@@ -70,6 +75,10 @@ public function all($project, array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/IssuePriority.php b/src/Redmine/Api/IssuePriority.php
index eb1eb5e1..ebd04219 100644
--- a/src/Redmine/Api/IssuePriority.php
+++ b/src/Redmine/Api/IssuePriority.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * Listing issue priorities.
@@ -23,13 +24,17 @@ class IssuePriority extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of issue priorities found
      */
     final public function list(array $params = []): array
     {
-        $this->issuePriorities = $this->retrieveData('/enumerations/issue_priorities.json', $params);
+        try {
+            $this->issuePriorities = $this->retrieveData('/enumerations/issue_priorities.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->issuePriorities;
     }
@@ -56,6 +61,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/IssueRelation.php b/src/Redmine/Api/IssueRelation.php
index 262ebe2f..d5d4fc72 100644
--- a/src/Redmine/Api/IssueRelation.php
+++ b/src/Redmine/Api/IssueRelation.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\JsonSerializer;
 
 /**
@@ -25,13 +26,17 @@ class IssueRelation extends AbstractApi
      * @param int   $issueId the issue id
      * @param array $params  optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of relations found
      */
     final public function listByIssueId(int $issueId, array $params = []): array
     {
-        $this->relations = $this->retrieveData('/issues/'.strval($issueId).'/relations.json', $params);
+        try {
+            $this->relations = $this->retrieveData('/issues/'.strval($issueId).'/relations.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->relations;
     }
@@ -59,6 +64,10 @@ public function all($issueId, array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/IssueStatus.php b/src/Redmine/Api/IssueStatus.php
index 3df6d5e1..8b886758 100644
--- a/src/Redmine/Api/IssueStatus.php
+++ b/src/Redmine/Api/IssueStatus.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * Listing issue statuses.
@@ -23,13 +24,17 @@ class IssueStatus extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of issue statuses found
      */
     final public function list(array $params = []): array
     {
-        $this->issueStatuses = $this->retrieveData('/issue_statuses.json', $params);
+        try {
+            $this->issueStatuses = $this->retrieveData('/issue_statuses.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->issueStatuses;
     }
@@ -56,6 +61,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Membership.php b/src/Redmine/Api/Membership.php
index e1570830..0c8ebf70 100644
--- a/src/Redmine/Api/Membership.php
+++ b/src/Redmine/Api/Membership.php
@@ -6,6 +6,7 @@
 use Redmine\Exception\InvalidParameterException;
 use Redmine\Exception\MissingParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\XmlSerializer;
 
 /**
@@ -28,7 +29,7 @@ class Membership extends AbstractApi
      * @param array      $params            optional parameters to be passed to the api (offset, limit, ...)
      *
      * @throws InvalidParameterException if $projectIdentifier is not of type int or string
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of memberships found
      */
@@ -41,7 +42,11 @@ final public function listByProject($projectIdentifier, array $params = []): arr
             ));
         }
 
-        $this->memberships = $this->retrieveData('/projects/'.strval($projectIdentifier).'/memberships.json', $params);
+        try {
+            $this->memberships = $this->retrieveData('/projects/'.strval($projectIdentifier).'/memberships.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->memberships;
     }
@@ -69,6 +74,10 @@ public function all($project, array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/News.php b/src/Redmine/Api/News.php
index 12953c0d..0426dc83 100644
--- a/src/Redmine/Api/News.php
+++ b/src/Redmine/Api/News.php
@@ -5,6 +5,7 @@
 use Redmine\Exception;
 use Redmine\Exception\InvalidParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @see   http://www.redmine.org/projects/redmine/wiki/Rest_News
@@ -24,7 +25,7 @@ class News extends AbstractApi
      * @param array      $params            optional parameters to be passed to the api (offset, limit, ...)
      *
      * @throws InvalidParameterException if $projectIdentifier is not of type int or string
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of news found
      */
@@ -37,7 +38,11 @@ final public function listByProject($projectIdentifier, array $params = []): arr
             ));
         }
 
-        $this->news = $this->retrieveData('/projects/'.strval($projectIdentifier).'/news.json', $params);
+        try {
+            $this->news = $this->retrieveData('/projects/'.strval($projectIdentifier).'/news.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->news;
     }
@@ -49,13 +54,17 @@ final public function listByProject($projectIdentifier, array $params = []): arr
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of news found
      */
     final public function list(array $params = []): array
     {
-        $this->news = $this->retrieveData('/news.json', $params);
+        try {
+            $this->news = $this->retrieveData('/news.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->news;
     }
@@ -87,6 +96,10 @@ public function all($project = null, array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Project.php b/src/Redmine/Api/Project.php
index 3a5a82c1..b5e962f3 100755
--- a/src/Redmine/Api/Project.php
+++ b/src/Redmine/Api/Project.php
@@ -5,6 +5,7 @@
 use Redmine\Exception;
 use Redmine\Exception\MissingParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\PathSerializer;
 use Redmine\Serializer\XmlSerializer;
 
@@ -26,13 +27,17 @@ class Project extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of projects found
      */
     final public function list(array $params = []): array
     {
-        $this->projects = $this->retrieveData('/projects.json', $params);
+        try {
+            $this->projects = $this->retrieveData('/projects.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->projects;
     }
@@ -59,6 +64,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Query.php b/src/Redmine/Api/Query.php
index 18694a05..9b29b01f 100644
--- a/src/Redmine/Api/Query.php
+++ b/src/Redmine/Api/Query.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * Custom queries retrieval.
@@ -23,13 +24,17 @@ class Query extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of queries found
      */
     final public function list(array $params = []): array
     {
-        $this->query = $this->retrieveData('/queries.json', $params);
+        try {
+            $this->query = $this->retrieveData('/queries.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->query;
     }
@@ -56,6 +61,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Role.php b/src/Redmine/Api/Role.php
index 30b4e8a4..49488cfd 100644
--- a/src/Redmine/Api/Role.php
+++ b/src/Redmine/Api/Role.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * Listing roles.
@@ -23,13 +24,17 @@ class Role extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of roles found
      */
     final public function list(array $params = []): array
     {
-        $this->roles = $this->retrieveData('/roles.json', $params);
+        try {
+            $this->roles = $this->retrieveData('/roles.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->roles;
     }
@@ -56,6 +61,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Search.php b/src/Redmine/Api/Search.php
index c7c31c3d..cd68f23d 100644
--- a/src/Redmine/Api/Search.php
+++ b/src/Redmine/Api/Search.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @see   http://www.redmine.org/projects/redmine/wiki/Rest_Search
@@ -20,14 +21,19 @@ class Search extends AbstractApi
      * @param string $query  string to search
      * @param array  $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of results (projects, issues)
      */
     final public function listByQuery(string $query, array $params = []): array
     {
         $params['q'] = $query;
-        $this->results = $this->retrieveData('/search.json', $params);
+
+        try {
+            $this->results = $this->retrieveData('/search.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->results;
     }
@@ -55,6 +61,10 @@ public function search($query, array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/TimeEntry.php b/src/Redmine/Api/TimeEntry.php
index e1586271..5441c918 100644
--- a/src/Redmine/Api/TimeEntry.php
+++ b/src/Redmine/Api/TimeEntry.php
@@ -5,6 +5,7 @@
 use Redmine\Exception;
 use Redmine\Exception\MissingParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\XmlSerializer;
 
 /**
@@ -25,13 +26,17 @@ class TimeEntry extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of time entries found
      */
     final public function list(array $params = []): array
     {
-        $this->timeEntries = $this->retrieveData('/time_entries.json', $params);
+        try {
+            $this->timeEntries = $this->retrieveData('/time_entries.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->timeEntries;
     }
@@ -58,6 +63,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/TimeEntryActivity.php b/src/Redmine/Api/TimeEntryActivity.php
index 427a41ae..157671fb 100644
--- a/src/Redmine/Api/TimeEntryActivity.php
+++ b/src/Redmine/Api/TimeEntryActivity.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * Listing time entry activities.
@@ -21,13 +22,17 @@ class TimeEntryActivity extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of time entry activities found
      */
     final public function list(array $params = []): array
     {
-        $this->timeEntryActivities = $this->retrieveData('/enumerations/time_entry_activities.json', $params);
+        try {
+            $this->timeEntryActivities = $this->retrieveData('/enumerations/time_entry_activities.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->timeEntryActivities;
     }
@@ -52,6 +57,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Tracker.php b/src/Redmine/Api/Tracker.php
index 4358ec0a..2e924ce1 100644
--- a/src/Redmine/Api/Tracker.php
+++ b/src/Redmine/Api/Tracker.php
@@ -4,6 +4,7 @@
 
 use Redmine\Exception;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * Listing trackers.
@@ -23,13 +24,17 @@ class Tracker extends AbstractApi
      *
      * @param array $params optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of trackers found
      */
     final public function list(array $params = []): array
     {
-        $this->trackers = $this->retrieveData('/trackers.json', $params);
+        try {
+            $this->trackers = $this->retrieveData('/trackers.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->trackers;
     }
@@ -56,6 +61,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/User.php b/src/Redmine/Api/User.php
index f4008aad..6261386b 100644
--- a/src/Redmine/Api/User.php
+++ b/src/Redmine/Api/User.php
@@ -5,6 +5,7 @@
 use Redmine\Exception;
 use Redmine\Exception\MissingParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\PathSerializer;
 use Redmine\Serializer\XmlSerializer;
 
@@ -26,13 +27,17 @@ class User extends AbstractApi
      *
      * @param array $params to allow offset/limit (and more) to be passed
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of users found
      */
     final public function list(array $params = []): array
     {
-        $this->users = $this->retrieveData('/users.json', $params);
+        try {
+            $this->users = $this->retrieveData('/users.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->users;
     }
@@ -59,6 +64,10 @@ public function all(array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Version.php b/src/Redmine/Api/Version.php
index 31863065..9d045d20 100644
--- a/src/Redmine/Api/Version.php
+++ b/src/Redmine/Api/Version.php
@@ -6,6 +6,7 @@
 use Redmine\Exception\InvalidParameterException;
 use Redmine\Exception\MissingParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\XmlSerializer;
 
 /**
@@ -27,7 +28,7 @@ class Version extends AbstractApi
      * @param string|int $projectIdentifier project id or literal identifier
      * @param array      $params            optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of versions found
      */
@@ -40,7 +41,11 @@ final public function listByProject($projectIdentifier, array $params = []): arr
             ));
         }
 
-        $this->versions = $this->retrieveData('/projects/'.strval($projectIdentifier).'/versions.json', $params);
+        try {
+            $this->versions = $this->retrieveData('/projects/'.strval($projectIdentifier).'/versions.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->versions;
     }
@@ -68,6 +73,10 @@ public function all($project, array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Api/Wiki.php b/src/Redmine/Api/Wiki.php
index fba8abab..8f6255bb 100644
--- a/src/Redmine/Api/Wiki.php
+++ b/src/Redmine/Api/Wiki.php
@@ -5,6 +5,7 @@
 use Redmine\Exception;
 use Redmine\Exception\InvalidParameterException;
 use Redmine\Exception\SerializerException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Serializer\PathSerializer;
 use Redmine\Serializer\XmlSerializer;
 
@@ -27,7 +28,7 @@ class Wiki extends AbstractApi
      * @param int|string $projectIdentifier project id or slug
      * @param array      $params  optional parameters to be passed to the api (offset, limit, ...)
      *
-     * @throws SerializerException if response body could not be converted into array
+     * @throws UnexpectedResponseException if response body could not be converted into array
      *
      * @return array list of wiki pages found for the given project
      */
@@ -40,7 +41,11 @@ final public function listByProject($projectIdentifier, array $params = []): arr
             ));
         }
 
-        $this->wikiPages = $this->retrieveData('/projects/'.strval($projectIdentifier).'/wiki/index.json', $params);
+        try {
+            $this->wikiPages = $this->retrieveData('/projects/'.strval($projectIdentifier).'/wiki/index.json', $params);
+        } catch (SerializerException $th) {
+            throw new UnexpectedResponseException('The Redmine server responded with an unexpected body.', $th->getCode(), $th);
+        }
 
         return $this->wikiPages;
     }
@@ -68,6 +73,10 @@ public function all($project, array $params = [])
                 return false;
             }
 
+            if ($e instanceof UnexpectedResponseException && $e->getPrevious() !== null) {
+                $e = $e->getPrevious();
+            }
+
             return $e->getMessage();
         }
     }
diff --git a/src/Redmine/Exception/UnexpectedResponseException.php b/src/Redmine/Exception/UnexpectedResponseException.php
new file mode 100644
index 00000000..1eb50427
--- /dev/null
+++ b/src/Redmine/Exception/UnexpectedResponseException.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Redmine\Exception;
+
+use Redmine\Exception as RedmineException;
+use RuntimeException;
+
+/**
+ * Exception if the Redmine server delivers an unexpected response.
+ *
+ * Use the following methods to investigate the response:
+ *
+ * - Redmine\Client\Client::getLastResponseStatusCode()
+ * - Redmine\Client\Client::getLastResponseContentType()
+ * - Redmine\Client\Client::getLastResponseBody()
+ */
+final class UnexpectedResponseException extends RuntimeException implements RedmineException
+{
+}
diff --git a/tests/Unit/Api/CustomField/ListTest.php b/tests/Unit/Api/CustomField/ListTest.php
index bf67684a..67a0c136 100644
--- a/tests/Unit/Api/CustomField/ListTest.php
+++ b/tests/Unit/Api/CustomField/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\CustomField;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\CustomField::list
@@ -129,4 +130,29 @@ public function testListCallsEndpointUntilOffsetIsHigherThanTotalCount()
         // Perform the tests
         $this->assertSame($returnDataSet, $api->list($allParameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/custom_fields.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new CustomField($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Group/ListTest.php b/tests/Unit/Api/Group/ListTest.php
index 5e8cfdaa..203c14dc 100644
--- a/tests/Unit/Api/Group/ListTest.php
+++ b/tests/Unit/Api/Group/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\Group;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\Group::list
@@ -63,4 +64,29 @@ public function testListeWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/groups.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Group($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Issue/ListTest.php b/tests/Unit/Api/Issue/ListTest.php
index 94c23cbe..8245f04a 100644
--- a/tests/Unit/Api/Issue/ListTest.php
+++ b/tests/Unit/Api/Issue/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\Issue;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\Issue::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/issues.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Issue($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/IssueCategory/ListByProjectTest.php b/tests/Unit/Api/IssueCategory/ListByProjectTest.php
index 563a392b..2f50610d 100644
--- a/tests/Unit/Api/IssueCategory/ListByProjectTest.php
+++ b/tests/Unit/Api/IssueCategory/ListByProjectTest.php
@@ -6,6 +6,7 @@
 use Redmine\Api\IssueCategory;
 use Redmine\Client\Client;
 use Redmine\Exception\InvalidParameterException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Tests\Fixtures\MockClient;
 use stdClass;
 
@@ -93,4 +94,29 @@ public static function getInvalidProjectIdentifiers(): array
             'object' => [new stdClass()],
         ];
     }
+
+    public function testListByProjectThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/projects/5/issue_categories.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new IssueCategory($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->listByProject(5);
+    }
 }
diff --git a/tests/Unit/Api/IssuePriority/ListTest.php b/tests/Unit/Api/IssuePriority/ListTest.php
index 855f9074..3733d4eb 100644
--- a/tests/Unit/Api/IssuePriority/ListTest.php
+++ b/tests/Unit/Api/IssuePriority/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\IssuePriority;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\IssuePriority::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($allParameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/enumerations/issue_priorities.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new IssuePriority($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/IssueRelation/ListByIssueIdTest.php b/tests/Unit/Api/IssueRelation/ListByIssueIdTest.php
index c05c4866..b03a5739 100644
--- a/tests/Unit/Api/IssueRelation/ListByIssueIdTest.php
+++ b/tests/Unit/Api/IssueRelation/ListByIssueIdTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\IssueRelation;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\IssueRelation::listByIssueId
@@ -63,4 +64,29 @@ public function testListByIssueIdWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->listByIssueId(5, $parameters));
     }
+
+    public function testListByIssueIdThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/issues/5/relations.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new IssueRelation($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->listByIssueId(5);
+    }
 }
diff --git a/tests/Unit/Api/IssueStatus/ListTest.php b/tests/Unit/Api/IssueStatus/ListTest.php
index 801d2b3c..ed23646a 100644
--- a/tests/Unit/Api/IssueStatus/ListTest.php
+++ b/tests/Unit/Api/IssueStatus/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\IssueStatus;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\IssueStatus::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/issue_statuses.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new IssueStatus($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Membership/ListByProjectTest.php b/tests/Unit/Api/Membership/ListByProjectTest.php
index 55b4b49a..975d187e 100644
--- a/tests/Unit/Api/Membership/ListByProjectTest.php
+++ b/tests/Unit/Api/Membership/ListByProjectTest.php
@@ -6,6 +6,7 @@
 use Redmine\Api\Membership;
 use Redmine\Client\Client;
 use Redmine\Exception\InvalidParameterException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Tests\Fixtures\MockClient;
 use stdClass;
 
@@ -91,4 +92,29 @@ public static function getInvalidProjectIdentifiers(): array
             'object' => [new stdClass()],
         ];
     }
+
+    public function testListByProjectThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/projects/5/memberships.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Membership($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->listByProject(5);
+    }
 }
diff --git a/tests/Unit/Api/News/ListByProjectTest.php b/tests/Unit/Api/News/ListByProjectTest.php
index 1b42ce5c..a2bd817f 100644
--- a/tests/Unit/Api/News/ListByProjectTest.php
+++ b/tests/Unit/Api/News/ListByProjectTest.php
@@ -6,6 +6,7 @@
 use Redmine\Api\News;
 use Redmine\Client\Client;
 use Redmine\Exception\InvalidParameterException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Tests\Fixtures\MockClient;
 use stdClass;
 
@@ -93,4 +94,29 @@ public static function getInvalidProjectIdentifiers(): array
             'object' => [new stdClass()],
         ];
     }
+
+    public function testListByProjectThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/projects/5/news.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new News($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->listByProject(5);
+    }
 }
diff --git a/tests/Unit/Api/News/ListTest.php b/tests/Unit/Api/News/ListTest.php
index 80e2ef38..f4db14d8 100644
--- a/tests/Unit/Api/News/ListTest.php
+++ b/tests/Unit/Api/News/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\News;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\News::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/news.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new News($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Project/ListTest.php b/tests/Unit/Api/Project/ListTest.php
index ede326d0..26efd4b3 100644
--- a/tests/Unit/Api/Project/ListTest.php
+++ b/tests/Unit/Api/Project/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\Project;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\Project::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/projects.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Project($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Query/ListTest.php b/tests/Unit/Api/Query/ListTest.php
index 01e46773..5858fb3e 100644
--- a/tests/Unit/Api/Query/ListTest.php
+++ b/tests/Unit/Api/Query/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\Query;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\Query::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/queries.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Query($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Role/ListTest.php b/tests/Unit/Api/Role/ListTest.php
index d274a1b2..276af29d 100644
--- a/tests/Unit/Api/Role/ListTest.php
+++ b/tests/Unit/Api/Role/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\Role;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\Role::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/roles.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Role($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Search/ListByQueryTest.php b/tests/Unit/Api/Search/ListByQueryTest.php
index e4d4740c..8cc25ff2 100644
--- a/tests/Unit/Api/Search/ListByQueryTest.php
+++ b/tests/Unit/Api/Search/ListByQueryTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\Search;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Tests\Fixtures\MockClient;
 
 /**
@@ -64,4 +65,29 @@ public function testListByQueryWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->listByQuery('query', $parameters));
     }
+
+    public function testListByQueryThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/search.json?limit=25&offset=0&q=query')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Search($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->listByQuery('query');
+    }
 }
diff --git a/tests/Unit/Api/TimeEntry/ListTest.php b/tests/Unit/Api/TimeEntry/ListTest.php
index 126dcca4..b5b24b06 100644
--- a/tests/Unit/Api/TimeEntry/ListTest.php
+++ b/tests/Unit/Api/TimeEntry/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\TimeEntry;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\TimeEntry::list
@@ -67,4 +68,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/time_entries.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new TimeEntry($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/TimeEntryActivity/ListTest.php b/tests/Unit/Api/TimeEntryActivity/ListTest.php
index d296ca0c..b5f1deb0 100644
--- a/tests/Unit/Api/TimeEntryActivity/ListTest.php
+++ b/tests/Unit/Api/TimeEntryActivity/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\TimeEntryActivity;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @coversDefaultClass \Redmine\Api\TimeEntryActivity::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/enumerations/time_entry_activities.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new TimeEntryActivity($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Tracker/ListTest.php b/tests/Unit/Api/Tracker/ListTest.php
index 66ed63ed..b6a7b465 100644
--- a/tests/Unit/Api/Tracker/ListTest.php
+++ b/tests/Unit/Api/Tracker/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\Tracker;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\Tracker::list
@@ -63,4 +64,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/trackers.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Tracker($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/User/ListTest.php b/tests/Unit/Api/User/ListTest.php
index 82c554a2..7f1b016d 100644
--- a/tests/Unit/Api/User/ListTest.php
+++ b/tests/Unit/Api/User/ListTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use Redmine\Api\User;
 use Redmine\Client\Client;
+use Redmine\Exception\UnexpectedResponseException;
 
 /**
  * @covers \Redmine\Api\User::list
@@ -66,4 +67,29 @@ public function testListWithParametersReturnsResponse()
         // Perform the tests
         $this->assertSame($expectedReturn, $api->list($parameters));
     }
+
+    public function testListThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/users.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new User($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->list();
+    }
 }
diff --git a/tests/Unit/Api/Version/ListByProjectTest.php b/tests/Unit/Api/Version/ListByProjectTest.php
index 55d5e063..349347a4 100644
--- a/tests/Unit/Api/Version/ListByProjectTest.php
+++ b/tests/Unit/Api/Version/ListByProjectTest.php
@@ -6,6 +6,7 @@
 use Redmine\Api\Version;
 use Redmine\Client\Client;
 use Redmine\Exception\InvalidParameterException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Tests\Fixtures\MockClient;
 use stdClass;
 
@@ -94,4 +95,29 @@ public static function getInvalidProjectIdentifiers(): array
             'object' => [new stdClass()],
         ];
     }
+
+    public function testListByProjectThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/projects/5/versions.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Version($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->listByProject(5);
+    }
 }
diff --git a/tests/Unit/Api/Wiki/ListByProjectTest.php b/tests/Unit/Api/Wiki/ListByProjectTest.php
index b08d6c2e..fc99da2d 100644
--- a/tests/Unit/Api/Wiki/ListByProjectTest.php
+++ b/tests/Unit/Api/Wiki/ListByProjectTest.php
@@ -6,6 +6,7 @@
 use Redmine\Api\Wiki;
 use Redmine\Client\Client;
 use Redmine\Exception\InvalidParameterException;
+use Redmine\Exception\UnexpectedResponseException;
 use Redmine\Tests\Fixtures\MockClient;
 use stdClass;
 
@@ -94,4 +95,29 @@ public static function getInvalidProjectIdentifiers(): array
             'object' => [new stdClass()],
         ];
     }
+
+    public function testListByProjectThrowsException()
+    {
+        // Create the used mock objects
+        $client = $this->createMock(Client::class);
+        $client->expects($this->exactly(1))
+            ->method('requestGet')
+            ->with('/projects/5/wiki/index.json')
+            ->willReturn(true);
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseBody')
+            ->willReturn('');
+        $client->expects($this->exactly(1))
+            ->method('getLastResponseContentType')
+            ->willReturn('application/json');
+
+        // Create the object under test
+        $api = new Wiki($client);
+
+        $this->expectException(UnexpectedResponseException::class);
+        $this->expectExceptionMessage('The Redmine server responded with an unexpected body.');
+
+        // Perform the tests
+        $api->listByProject(5);
+    }
 }