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', '8fdd173db96b4ad22df91bb9c3834851', '216.73.216.53', '1752094738', '1752094738', '/shop_content.php/language/de/coID/7/content/Kontakt')

[XT SQL Error]