how to restore deleted folders from Zotero App

Suddenly my folders appeared double in my zotero App, I deleted one of each and then all of them where gone...can not be found in the deleted items and also undo is not possible? Any ideas how this can happen?
  • edited November 16, 2019
    We haven't be able to reproduce it ourselves, but there've been some reports of a visual bug where collections appear in duplicate until Zotero is restarted, and deleting one of them deletes the real collection.

    You should immediately (before starting or closing Zotero) make a backup of the zotero.sqlite* files in your Zotero data directory and then try restoring the collections from one of your last automatic backups.
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