1366 - Incorrect integer value: '' for column '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', '70pr4oe7ku05o80g0v8ie9t712', '216.73.216.147', '1751601234', '1751601234', '/index.php?cat=c13_Accessoires.html&XTCsid=d163dd0fc0b54bf3066f85422c77e00a')

[XT SQL Error]