diff --git a/src/main/java/com/hankcs/hanlp/seg/Segment.java b/src/main/java/com/hankcs/hanlp/seg/Segment.java
index 2b7e798e1..4e94237e8 100644
--- a/src/main/java/com/hankcs/hanlp/seg/Segment.java
+++ b/src/main/java/com/hankcs/hanlp/seg/Segment.java
@@ -235,6 +235,7 @@ protected static List<Vertex> combineByCustomDictionary(List<Vertex> vertexList)
         {
             for (int i = 0; i < wordNet.length; ++i)
             {
+                if (wordNet[i] == null) continue;
                 BaseNode<CoreDictionary.Attribute> state = CustomDictionary.trie.transition(wordNet[i].realWord.toCharArray(), 0);
                 if (state != null)
                 {