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', '7fd8ae1f9c5a45e8ebc39b4efe539231', '216.73.216.8', '1758067505', '1758067505', '/shop_content.php/language/de/coID/4')

[XT SQL Error]