Before the error happened, I was…
downloading the anking MCAT deck. I completed all steps, subscribed to the deck, and then opened anki and clicked sync. Everything went fine → install etc… I do see the deck, but there are no cards in it. When go in through browse, and tags, for all cards I see the following message: “Your database appears to be in an inconsistent state”.
Error message (don't change this)
Anki 2.1.66 (70506aeb) Python 3.9.15 Qt 6.5.2 PyQt 6.5.2
Platform: Windows-10-10.0.26200
Flags: frz=True ao=True sv=3
Add-ons, last update check: 2026-05-15 22:15:49
Traceback (most recent call last):
File "aqt.taskman", line 122, in _on_closures_pending
File "aqt.taskman", line 71, in <lambda>
File "aqt.taskman", line 90, in wrapped_done
File "C:\Users\Arian\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\subdecks.py", line 69, in _on_subdecks_updated
future.result()
File "concurrent.futures._base", line 439, in result
File "concurrent.futures._base", line 391, in __get_result
File "concurrent.futures.thread", line 58, in run
File "C:\Users\Arian\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\subdecks.py", line 21, in <lambda>
task=lambda: build_subdecks_and_move_cards_to_them(ankihub_did=ankihub_did, nids=nids),
File "C:\Users\Arian\AppData\Roaming\Anki2\addons21\1322529746\main\subdecks.py", line 67, in build_subdecks_and_move_cards_to_them
move_notes_to_decks_while_respecting_odid(nid_to_did=nid_to_did)
File "C:\Users\Arian\AppData\Roaming\Anki2\addons21\1322529746\main\utils.py", line 275, in move_notes_to_decks_while_respecting_odid
cids = aqt.mw.col.db.list(f"SELECT id FROM cards WHERE nid={nid}")
AttributeError: 'NoneType' object has no attribute 'list'