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', 'e3bd5c524f997c80520910ae2c7756f6', '3.90.242.249', '1711661353', '1711661353', '/index.php?cat=c2_T-Shirts--Druck-selber-gestalten.html')

[XT SQL Error]