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', '1vurh5lea0btojt5t6i1cnqkq2', '3.15.26.235', '1738999059', '1738999059', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c1140_Zahlungsterminal-Akkus.html')

[XT SQL Error]