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', 'qn6plml1bpp67flvkmib6hc5b3', '3.137.152.81', '1747105719', '1747105719', '/product_info.php?info=p639_806408-Ersatzheizstab-fuer-Bruehkessel--3-kW.html')

[XT SQL Error]