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', 'ta8cd4d600uqti838e002uug00', '3.144.18.202', '1738999236', '1738999236', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c1194_Makita-4-8Volt-Akku.html')

[XT SQL Error]