What does the error message mean and what should I do?

Hey. I was just trying to learn some maps, but I get this error message every time:

Anki 2.1.65 (aa9a734f) Python 3.9.15 Qt 6.4.3 PyQt 6.4.0
Plattform: Windows-10-10.0.19045
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2023-06-11 18:23:55.

Caught exception:
Traceback (last call):
File “aqt.webview”, line 46, in cmd
File “aqt.webview”, line 153, in _onCmd
file “aqt.webview”, line 662, in _onBridgeCmd
file “aqt.overview”, line 92, in _linkHandler
file “aqt.main”, line 712, in moveToState
file “aqt.main”, line 733, in _reviewState
file “aqt.reviewer”, line 161, in show
file “aqt.reviewer”, line 181, in refresh_if_needed
file “aqt.reviewer”, line 241, in nextCard
file “aqt.reviewer”, line 343, in _initWeb
file “aqt.reviewer”, line 691, in _bottomHTML
file “anki.cards”, line 198, in time_taken
file “anki.cards”, line 177, in time_limit
file “anki.decks”, line 307, in config_dict_for_deck_id
TypeError: argument of type ‘NoneType’ is not iterable

I have already checked the database. I have also done a manual synchronization. I have already reinstalled Anki and I have also disabled all addons. Still I get the error message.

Does anyone have any idea?

Try opening the deck options for the deck you’re reviewing, and change the preset to another one and back. If problems persist, please point me to the deck in question.

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