I keep getting this error and I was wondering if someone could help me with this

Anki Help
1

I keep getting this error and I was wondering if someone could help me with this.

Anki 2.1.47 (dc156f34) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.16
Flags: frz=True ao=False sv=2
Add-ons, last update check: 2022-03-15 13:04:46

Caught exception:
Traceback (most recent call last):
File “aqt/webview.py”, line 541, in handler
File “aqt/reviewer.py”, line 701, in _onTypedAnswer
File “aqt/reviewer.py”, line 381, in _showAnswer
File “aqt/reviewer.py”, line 756, in _showEaseButtons
File “aqt/reviewer.py”, line 843, in _answerButtons
File “aqt/reviewer.py”, line 829, in but
File “aqt/reviewer.py”, line 853, in _buttonTime
File “anki/scheduler/v2.py”, line 1140, in nextIvlStr
File “anki/scheduler/v2.py”, line 1035, in nextIvl
File “anki/scheduler/v2.py”, line 910, in _nextRevIvl
TypeError: ‘>’ not supported between instances of ‘NoneType’ and ‘int’

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I no longer do programming, but there are discussions of that error on StackOverflow:
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3

Please follow the steps on When problems occur - Frequently Asked Questions