Error uploading collection via the Collection Import feature

{"ops":[{"insert":"I have long been uploading lists of cards utilizing the following format: Ignore, Ignore, Quantity, ScryfallID.\n\nRecently though I have started receiving the following error:\n\"Upload Failed\nlocal variable 'second_lookup_type_is_ambiguous' referenced before assignment\"\n\nI have attempted to remove the ignore columns and this error persists.\n\nAny help would be appreciated,\n\nThanks!\n"}]}