diff --git a/MLAPI-Editor/PostProcessScene.cs b/MLAPI-Editor/PostProcessScene.cs
index 62498c0446..0e122e6479 100644
--- a/MLAPI-Editor/PostProcessScene.cs
+++ b/MLAPI-Editor/PostProcessScene.cs
@@ -16,7 +16,7 @@ public static void ProcessScene()
             traverseSortedObjects.Sort((x, y) =>
             {
                 List<int> xSiblingIndex = x.TraversedSiblingIndex();
-                List<int> ySiblingIndex = x.TraversedSiblingIndex();
+                List<int> ySiblingIndex = y.TraversedSiblingIndex();
 
                 while (xSiblingIndex.Count > 0 && ySiblingIndex.Count > 0)
                 {