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', 'shr1uftn9frumtqbo3176f40t1', '216.73.216.112', '1761555047', '1761555047', '/product_info.php?info=p510_Flugmischung-fuer-Turbo--Meister-25kg-LTM.html')

[XT SQL Error]