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I also meet this issue. `OnDropObjects` is frequently used and this exception really annoying. It seems users cannot resolve this problem without modifying xNode source code. Could you please add...

@Siccity Hi, I find how this bug happens: In `NodeGraghEditor.CreateNode()` line 175, `NodeEditorWindow.RepaintAll()` is called without checking current event type. See [this documentation](https://docs.unity3d.com/ScriptReference/Event.html) and [this forum page](https://forum.unity.com/threads/argumentexception-getting-control-0s-position-in-a-group-with-only-0-controls-when.135021/) for more infomation....

It happens because NaughtyAttributes rely on the attribute `[CustomEditer(Object, true)]` for its main editor, and may break other custom editors. It's not easy to fix. But if any one who...

I know I'm late, but Unity now has an attribute [`SerializeReference`](https://docs.unity3d.com/ScriptReference/SerializeReference.html) that can serialize interfaces, is this what you need? However, the `SerializeReference` attrubute won't work if field is inherited...