"Cannot set parent of collection ... to invalid parent"

This was on the first sync of a brand new profile with a library already on the server.

Report ID: 1150051393
Error: [Exception... "'Cannot set parent of collection 3707 to invalid parent 275' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "" data: no]

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