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', 'f1dcc8b365c06f0cc2f82001ba2419d1', '216.73.216.198', '1752880668', '1752880668', '/shop_content.php/coID/7')

[XT SQL Error]