Error keeps popping up when I review

I have disabled all add-ons but every time I click “Good” on a card, an error window pops up saying this.

"Anki 2.1.49 (dc80804a) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=False sv=2
Add-ons, last update check: 2022-11-24 00:02:06

Caught exception:
Traceback (most recent call last):
File “aqt\webview.py”, line 541, in handler
File “aqt\reviewer.py”, line 704, in _onTypedAnswer
File “aqt\reviewer.py”, line 383, in _showAnswer
File “aqt\reviewer.py”, line 759, in _showEaseButtons
File “aqt\reviewer.py”, line 846, in _answerButtons
File “aqt\reviewer.py”, line 832, in but
File “aqt\reviewer.py”, line 856, in _buttonTime
File “anki\scheduler\v2.py”, line 1140, in nextIvlStr
File “anki\scheduler\v2.py”, line 1028, in nextIvl
File “anki\scheduler\v2.py”, line 864, in _lapseIvl
TypeError: unsupported operand type(s) for *: ‘int’ and ‘NoneType’
"

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