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', 'ge59ce2cmj8icna8q3gjc03u71', '3.138.124.211', '1738999445', '1738999445', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c461_Externe-Akkus.html')

[XT SQL Error]