Invalid editor window UnityEditor.FallbackEditorWindow Error

Version: 2020.3.0f1

Does anyone know what this means, why I’m getting it and what to do to fix it? It doesn’t seem to have any effect on anything, but it pops up on my console pretty much randomly but never later than 20-40 seconds after clearing the console log.

I used to have the same issue back on Unity 2017.3.f9q019.asd.21q34a.sriqölae and figured I could finally get rid of it by upgrading, but of couse the issue came back.

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