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', '8ab3f29c49070dcdf9b3b63a522e1f17', '216.73.216.8', '1758077780', '1758077780', '/index.php/language/de/cat/c30_Countries.html/page/2')

[XT SQL Error]