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', 'b21805fc4187844930e2e01a4a1c3897', '3.144.172.115', '1713855095', '1713855095', '/product_info.php?info=p321_Selbstklebende-Folie--Planenfolie--Bannerfolie.html')

[XT SQL Error]