diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/action/Action.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/action/Action.java
index 3ddbf7b82..25be32da5 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/action/Action.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/action/Action.java
@@ -982,7 +982,7 @@ public abstract class Action implements GraphSourceItem {
                 public List<GraphTargetItem> call() throws Exception {
                     int staticOperation = 0;
                     boolean insideDoInitAction = (asm instanceof DoInitActionTag);
-                    List<GraphTargetItem> tree = actionsToTree(asm.getSwf().needsCalculatingAS2UninitializeClassTraits(asm), uninitializedClassTraits, insideDoInitAction, false, new HashMap<>(), new HashMap<>(), new HashMap<>(), actions, version, staticOperation, path, charset);
+                    List<GraphTargetItem> tree = actionsToTree(asm == null ? false : swf.needsCalculatingAS2UninitializeClassTraits(asm), uninitializedClassTraits, insideDoInitAction, false, new HashMap<>(), new HashMap<>(), new HashMap<>(), actions, version, staticOperation, path, charset);
                     SWFDecompilerPlugin.fireActionTreeCreated(tree, swf);
                     for (ActionTreeOperation treeOperation : treeOperations) {
                         treeOperation.run(tree);