My Anki desktop app stopped working

Error
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.
When you’ve discovered the add-on that is causing the problem, please report the issue on the add-on support site.
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\taskman.py”, line 87, in _on_closures_pending
File “aqt\taskman.py”, line 59, in
File “aqt\taskman.py”, line 76, in wrapped_done
File “aqt\sync.py”, line 113, in on_future_done
File “aqt\main.py”, line 911, in on_collection_sync_finished
File “aqt\main.py”, line 699, in reset
File “aqt\main.py”, line 661, in moveToState
File “aqt\main.py”, line 683, in _reviewState
File “aqt\reviewer.py”, line 65, in show
File “aqt\reviewer.py”, line 110, in nextCard
File “anki\schedv2.py”, line 63, in getCard
File “anki\sched.py”, line 165, in _getCard
File “anki\schedv2.py”, line 843, in _getRevCard
File “<C:\Program Files\Anki\decorator.pyc:decorator-gen-24>”, line 2, in _fillRev
File “anki\hooks.py”, line 638, in decorator_wrapper
File “anki\hooks.py”, line 635, in reply
TypeError: fillRev() got multiple values for argument ‘_old’