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', 'cm3dgm3h9cur8csi21061k7fr5', '216.73.216.141', '1751418093', '1751418093', '/shop_content.php?coID=2&XTCsid=903d490a11e72fb45b2507d2f3478040')

[XT SQL Error]