Zotero does not sync anymore: "An error occurred during syncing: invalid attachment hash 'undefined'

The Report ID of my problem is: 1748502714

I am using 5.0.52 on Win10 64 with my personal webdav to sync my library (mainly PDF).
Until recently everything worked well.

However, since some days I cannot sync my library anymore.
If I click on the sync-button in the stand alone zotero, the message:
"An error occurred during syncing: invalid attachment hash 'undefined' appears.

I tried to do following to solve the problem
tried to run an update
restarted Zotero
restarted my computer

without sucess
  • Sorry for the delay.

    If you're still seeing this, can you provide a Debug ID (different from a Report ID) for a sync attempt that produces it?

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