Suspended cards showing in deck + error message showing up

I opened anki, saw that I had 80 cards in my ‘custom study deck’ (which I cleared yesterday and didn’t add any new cards today). I went to study them anyway and noticed a card I have never seen before (it should have been suspended). Then, I press spacebar to continue and the below error message shows up. I tried to disable add-ons and ‘check database’, didn’t fix anything.

An error occurred. Please use Tools > Check Database to see if that fixes the problem.
If problems persist, please report the problem on our support site. Please copy and paste the information below into your report.
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: 2023-10-21 19:19:09

Caught exception:
Traceback (most recent call last):
File “aqt\”, line 541, in handler
File “aqt\”, line 704, in _onTypedAnswer
File “aqt\”, line 383, in _showAnswer
File “aqt\”, line 759, in _showEaseButtons
File “aqt\”, line 846, in _answerButtons
File “aqt\”, line 832, in but
File “aqt\”, line 856, in _buttonTime
File “anki\scheduler\”, line 1140, in nextIvlStr
File “anki\scheduler\”, line 1033, in nextIvl
File “anki\scheduler\”, line 969, in _earlyReviewIvl

Please see When problems occur - Frequently Asked Questions. After updating to the latest Anki, I recommend you enable the v3 scheduler. The Anki v3 scheduler - Frequently Asked Questions

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