1366 - Incorrect integer value: '' for column `CP_as15`.`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', 'b04e3hc89ngb2i0cf08a0u9t81', '3.12.151.193', '1738995175', '1738995175', '/index.php?XTCsid=qi1463dp261ivpfjuiqmhrofh5&cat=c1012_Geschenkidee.html')

[XT SQL Error]