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', 'vmsu95b1mpahfgcb656d35jee6', '18.189.171.137', '1738995826', '1738995826', '/index.php?XTCsid=3ea3bnp0vmbqarg8bfequsbfv5&cat=c538_Gesipa-Werkzeug-Akku.html')

[XT SQL Error]