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', 'b562a97bdae2586c85271b68b4e0be34', '216.73.216.3', '1766435714', '1766435714', '/index.php/language/de/cat/c30_Countries.html/page/2')

[XT SQL Error]