Zotero error 1921633966. On restart a collection disappeared

Second time this happened. First time the collection name was Word
I somehow was able to recover the content and put it into a collection WordB
Now this collection disappeared
  • [JavaScript Error: "TypeError: this._rows[row] is undefined" {file: "chrome://zotero/content/xpcom/libraryTreeView.js" line: 306}]

    [JavaScript Error: "Cannot move collection into itself!" {file: "chrome://zotero/content/xpcom/data/collection.js" line: 258}]
    Somehow you triggered an error that occurs if you try to move a collection into itself. That shouldn't be possible via the UI, obviously, so this is some sort of bug, but if you can reproduce this error, we'd want to know what you're doing.

    Invalid collection nesting should be prevented by this error, but if it somehow happened regardless, you should be able to fix it by checking your database integrity from the Advanced → Files and Folders pane of the Zotero preferences.
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