Why getting in editor the error SerializedObjectNotCreatableException: Object at index 0 is null ?

I’m using Unity 2019.2.5f1 Personal

I tried to close the inspector tab and re open it again but when running the game the error/exception is show again. It happens once I added a mixamo character to my scene.

But I tested now again even if removing the mixamo character from the scene this error/exception keep showing when running the game. It’s showing only when running the game.

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I just had this, but restarting the editor has seemed to fix it