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', 'mpn41q9tjoru8iivse267ln1e1', '3.137.211.240', '1738999579', '1738999579', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c1012_Geschenkidee.html')

[XT SQL Error]