diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/simpleparser/SimpleParser.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/simpleparser/SimpleParser.java
index 19702ec4e..b2d618a96 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/simpleparser/SimpleParser.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/simpleparser/SimpleParser.java
@@ -435,6 +435,9 @@ public interface SimpleParser {
                             type = externalSubTypes.remove(0);                                
                         }
                     } else {
+                        if (type == null) {
+                            break;
+                        }
                         traitKey = type.add(part);
                         if (!traitFullNameToDefinition.containsKey(traitKey)) {
                             if (simpleExternalClassNameToFullClassName.containsKey(type)) {