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', '8i9da0f0jp45t6itglnlc37or0', '216.73.216.89', '1766364299', '1766364299', '/product_info.php?info=p529_804701-Einsatz-fuer-100-Liter-Futterdaempfer.html')

[XT SQL Error]