AI Vs. AI: Stuck when starting a new game for the second time

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Describe the bug AI Vs. AI: Stuck when starting a new game for the second time

To Reproduce Steps to reproduce the behavior:

1. Go to AI Vs. AI.
2. Click on Game -> New game.
3. Wait for the game to end.
4. Click on Game -> New game.
5. No response.
6. Go to Human Vs. AI.
7. Error: AnimationController.stop() called after AnimationController.dispose()

Expected behavior

The game between White and Black will start automatically.