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', '8cc86c6e93a7a7b3c17323a993294757', '216.73.216.142', '1758251798', '1758251798', '/shop_content.php/language/de/coID/7/content/Kontakt')

[XT SQL Error]