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', 'a73cc72ec676ce370621e19d9c605915', '216.73.216.110', '1768468235', '1768468235', '/index.php/language/de/cat/c35_Countries.html/page/1')

[XT SQL Error]