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', 'a3fc39b7c3d656fed24540a058498cae', '3.15.190.144', '1715171792', '1715171792', '/product_info.php?info=p306_Selbstklebende-Folie--Dekofolie.html')

[XT SQL Error]