Anki add-on: Fix invalid card IDs

This simple add-on fixes invalid card IDs in your collection. After installing the add-on, restart Anki to apply the changes. For more information, see this forum thread . If you don't know whether you need to run this add-on, open Anki Card Browser and type added:1 . If you see a large number of cards that you haven't added today, install this add-on to fix them. Anki will take a while to load the first time after installation.