Report ID: 1879353726 - Crash after 'items added from multiple locations' error

I'm using Zotero Sync. The first problem seemed to be an error message saying I had added an item to a folder from multiple locations. I didn't understand whether this was indeed true--I suppose it is possible that I duplicated an item. I have definitely been adding items to the same folder, sometimes from one computer, sometimes from another. But this is what Zotero Sync is all about, no? It's been working fine for a few weeks now, too--why the error all of a sudden?

I couldn't see any obvious way to resolve the error, so I tried moving the offending "duplicate" item to a different folder. I did so, then deleted it from the folder it had been in, and this is what caused the crash described by report ID 1879353726.

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