1366 - Incorrect integer value: '' for column 'customer_id' at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '4d1j0l311d5l71dkck1ha382u2', '54.80.87.166', '1540038040', '1540038040', '/catalog/product_info.php?products_id=971&osCsid=konekjck7lldmfuguhofe5f2m2')

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