diff --git a/Source/Editor/SceneGraph/GUI/ActorTreeNode.cs b/Source/Editor/SceneGraph/GUI/ActorTreeNode.cs
index d31955acc..64def3eae 100644
--- a/Source/Editor/SceneGraph/GUI/ActorTreeNode.cs
+++ b/Source/Editor/SceneGraph/GUI/ActorTreeNode.cs
@@ -814,6 +814,7 @@ namespace FlaxEditor.SceneGraph.GUI
             _dragScripts = null;
             _dragAssets = null;
             _dragActorType = null;
+            _dragScriptItems = null;
             _dragHandlers?.Clear();
             _dragHandlers = null;
             _highlights = null;
diff --git a/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs b/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs
index 1cf5fb40b..351dd3f62 100644
--- a/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs
+++ b/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs
@@ -213,6 +213,7 @@ namespace FlaxEditor.Windows.Assets
                 _window = null;
                 _dragAssets = null;
                 _dragActorType = null;
+                _dragScriptItems = null;
                 _dragHandlers?.Clear();
                 _dragHandlers = null;
 
diff --git a/Source/Editor/Windows/SceneTreeWindow.cs b/Source/Editor/Windows/SceneTreeWindow.cs
index c1390a1fe..9385fb781 100644
--- a/Source/Editor/Windows/SceneTreeWindow.cs
+++ b/Source/Editor/Windows/SceneTreeWindow.cs
@@ -498,6 +498,7 @@ namespace FlaxEditor.Windows
         {
             _dragAssets = null;
             _dragActorType = null;
+            _dragScriptItems = null;
             _dragHandlers?.Clear();
             _dragHandlers = null;
             _tree = null;