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', 'b3f80aaab7dfb800e7f2073db9819c46', '216.73.216.8', '1758018757', '1758018757', '/index.php/language/en/refID/1/cat/c44_3D-Karten.html')

[XT SQL Error]