Sync error (821800053)

Error: [Exception... "'Linked item I7SHIT3I doesn't exist in Zotero.Sync.Server.Data.xmlToTag()' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]

How can I get some information on what item(s) are troublesome?

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