1366 - Incorrect integer value: '' for column `hbl_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', 'vmens0er0bat6ppa3uujmvgoo4', '3.135.236.134', '1747386321', '1747386321', '/product_info.php?info=p640_806361-Ersatzheizstab-fuer-Bruehkessel--6-kW.html')

[XT SQL Error]