1366 - Incorrect integer value: '' for column `mapshopatlogis`.`whos_online`.`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', '03e7dadd8bc89b7502522444f78387b2', '216.73.216.142', '1758244259', '1758244259', '/shop_content.php/language/en/coID/1/content/Shipping---Returns')

[XT SQL Error]