Null references during Editor mode: Resolve of invalid GC handle

FlowCanvas Forums Support Null references during Editor mode: Resolve of invalid GC handle

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  • #3476
    Hello there!
    I keep getting a bunch of null references whenever I focus on the Canvas window for the first tiem after my files compile:

    Resolve of invalid GC handle. The handle is from a previous domain. The resolve operation is skipped.
    UnityEngine.GUILayout:Window (int,UnityEngine.Rect,UnityEngine.GUI/WindowFunction,string,UnityEngine.GUIStyle,UnityEngine.GUILayoutOption[])
    NodeCanvas.Framework.Node:DrawNodeWindow (NodeCanvas.Framework.Node,UnityEngine.Vector2,single) (at Assets/ParadoxNotion/CanvasCore/Framework/Design/PartialEditor/Editor.Node.cs:282)
    NodeCanvas.Framework.Node:ShowNodeGUI (NodeCanvas.Framework.Node,UnityEngine.Rect,bool,UnityEngine.Vector2,single) (at Assets/ParadoxNotion/CanvasCore/Framework/Design/PartialEditor/Editor.Node.cs:254)
    NodeCanvas.Editor.GraphEditor:ShowNodesGUI (NodeCanvas.Framework.Graph,UnityEngine.Rect,bool,UnityEngine.Vector2,single) (at Assets/ParadoxNotion/CanvasCore/Framework/Design/Editor/Windows/GraphEditor.cs:661)
    NodeCanvas.Editor.GraphEditor:OnGUI () (at Assets/ParadoxNotion/CanvasCore/Framework/Design/Editor/Windows/GraphEditor.cs:506)
    UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

    Any idea how I can avoid this?
    I’m using the very latest version of FlowCanvas: 3.2.6



    This has been flagged as a Unity bug unfortunately which I also reported to Unity and they said in the ticket that they know about it and that have fixed it in certain versions of Unity.  Here is also a thread I posted about this bug on the Unity forums. Could you please try upgrading to another Unity version please?


    Join us on Discord:


    Thank you! it worked great 🙂

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