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', 'd4lf3ob4b3a64gn7oot53sor90', '3.140.196.41', '1738997919', '1738997919', '/index.php?XTCsid=8e9c41f9ih262sbjeph8l1hut4&cat=c704_Mafell-Werkzeug-Akku.html')

[XT SQL Error]