My Anki desktop app stopped working

An error occurred. Please start Anki while holding down the shift key, which will temporarily disable the add-ons you have installed.
If the issue only occurs when add-ons are enabled, please use the Tools > Add-ons menu item to disable some add-ons and restart Anki, repeating until you discover the add-on that is causing the problem.
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Debug info:
Anki 2.1.33 (3f403040) Python 3.8.0 Qt 5.14.1 PyQt 5.14.1
Platform: Windows 10
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2020-10-02 05:16:24

Caught exception:
Traceback (most recent call last):
File “aqt\”, line 87, in _on_closures_pending
File “aqt\”, line 59, in
File “aqt\”, line 76, in wrapped_done
File “aqt\”, line 113, in on_future_done
File “aqt\”, line 911, in on_collection_sync_finished
File “aqt\”, line 699, in reset
File “aqt\”, line 661, in moveToState
File “aqt\”, line 683, in _reviewState
File “aqt\”, line 65, in show
File “aqt\”, line 110, in nextCard
File “anki\”, line 63, in getCard
File “anki\”, line 165, in _getCard
File “anki\”, line 843, in _getRevCard
File “<C:\Program Files\Anki\decorator.pyc:decorator-gen-24>”, line 2, in _fillRev
File “anki\”, line 638, in decorator_wrapper
File “anki\”, line 635, in reply
TypeError: fillRev() got multiple values for argument ‘_old’