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', 'e88155fe0eb6ffbf0dd1c497be05c48d', '216.73.216.21', '1770076296', '1770076296', '/index.php/language/de/cat/c35_Laender.html/page/1')

[XT SQL Error]