1366 - Incorrect integer value: '' for column `creatihu_shop`.`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', '88372e232bdfc3948f3bf28c1992c547', '54.166.96.191', '1711698991', '1711698991', '/product_info.php?info=p310_Selbstklebende-Folie--Spezialfolie-f--r-Planenfolie.html')

[XT SQL Error]