diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavaClientCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavaClientCodegen.java
index fe9b9ed2e57..93ca1911c57 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavaClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavaClientCodegen.java
@@ -342,6 +342,8 @@ public class JavaClientCodegen extends DefaultCodegen implements CodegenConfig {
                     continue;
                 List<String> values = (List<String>) allowableValues.get("values");
                 // put "enumVars" map into `allowableValues", including `name` and `value`
+                if (values == null)
+                    continue;
                 List<Map<String, String>> enumVars = new ArrayList<Map<String, String>>();
                 for (String value : values) {
                     Map<String, String> enumVar = new HashMap<String, String>();