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', 'gokv6go5j5gnm9es86qo2f4tp1', '13.59.244.1', '1738998972', '1738998972', '/index.php?XTCsid=rkdf8qfiujodbcb5st13ohfmn6&cat=c187_Makita-14-4Volt-Akku.html')

[XT SQL Error]