ANKI error on desktop

All of a suddenly ANKI started displaying an error, making it unusable. Disappointing since I bought the paid mobile app recently and need this to all work.

I restarted it. Still shows error.,
I restarted it with SHIFT, eliminating the add-on (font size). Still shows error.
I restarted my laptop. Still shows error.
I tried another study deck. Does not show an error.

The deck with the error is my primary study deck. Not sure what to do and any advice is welcome. Not sure I can recreate the study deck.


Debug info:
Anki 2.1.38 (355e4cd5) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.16
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2021-01-02 11:31:05

Caught exception:
Traceback (most recent call last):
File “aqt/”, line 515, in handler
File “aqt/”, line 547, in _onTypedAnswer
File “aqt/”, line 251, in _showAnswer
File “aqt/”, line 602, in _showEaseButtons
File “aqt/”, line 653, in _answerButtons
File “aqt/”, line 622, in _defaultEase
File “anki/”, line 115, in answerButtons
File “anki/”, line 281, in _lrnConf
File “anki/”, line 654, in _newConf
KeyError: ‘delays’

Thanks and a happy New Year to all.

This seems related:

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If the issue persists after removing filtered decks, please let us know.