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', 'ehlp95eb859h4k3qd2rr2nqhm5', '216.73.216.155', '1767581484', '1767581484', '/index.php?XTCsid=903d490a11e72fb45b2507d2f3478040&cat=c9_Tabledeko.html')

[XT SQL Error]