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', 'l7paolf86ncif9rri6d39hvb94', '3.12.74.180', '1738993911', '1738993911', '/index.php?XTCsid=7o9vvcq8f10964g5j8ia8t32h0&cat=c23_Camcorder-Akku.html')

[XT SQL Error]