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', '249dfb23b89349db2263b27a75796e32', '216.73.216.115', '1761500409', '1761500409', '/index.php/language/de/cat/c30_Countries.html/page/5')

[XT SQL Error]