Its a long time for this post, and also I'm not sure about the exact problem you encountered here, I had a similar exception, but in order to find the exact reasons, I need to get the code.
What I did for my code: In short, any obj.function() line can be a problem, since this happens several times, I assume it is in the render cycle of the current screen.
in more detail about my problem that I solved: I created the MyActor extends Actor class, had a sprite and TextureRegion (current frame from the sprite), creating a replica of this object, I set the value for the current frame (the act method was fetching the current frame, but drawing got called before the action), and it gave me a similar error.
I'm not sure if this helps or not, let me know if you achieve this.
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