diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/GraphPart.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/GraphPart.java
index 2998bf3c8..0f1c966e0 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/GraphPart.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/GraphPart.java
@@ -19,6 +19,7 @@ package com.jpexs.decompiler.graph;
 import com.jpexs.decompiler.flash.BaseLocalData;
 import java.io.Serializable;
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
 
 /**
@@ -123,7 +124,7 @@ public class GraphPart implements Serializable {
         return time;
     }
 
-    private boolean leadsTo(BaseLocalData localData, Graph gr, GraphSource code, GraphPart part, List<GraphPart> visited, List<Loop> loops) throws InterruptedException {
+    private boolean leadsTo(BaseLocalData localData, Graph gr, GraphSource code, GraphPart part, HashSet<GraphPart> visited, List<Loop> loops) throws InterruptedException {
         if (Thread.currentThread().isInterrupted()) {
             throw new InterruptedException();
         }
@@ -192,7 +193,7 @@ public class GraphPart implements Serializable {
         for (Loop l : loops) {
             l.leadsToMark = 0;
         }
-        return leadsTo(localData, gr, code, part, new ArrayList<>(), loops);
+        return leadsTo(localData, gr, code, part, new HashSet<>(), loops);
     }
 
     public GraphPart(int start, int end) {