Zotero crashed (#1404818379)

After searching some items in my library I selected some of the found items and tried them to drag into one of my group folders. In the middle pane it said that something went wrong and I would have to restart FF. Without starting FF I couldn't work with Zotero anymore "There was an error starting Zotero".

Two of the items had a PDF file attached.

I could reproduce this error with the same items and the same procedure, but I could copy them one by one.

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