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', '4l1gsld7j8m85q37feoo37k3i2', '216.73.216.89', '1766025519', '1766025519', '/product_info.php?info=p494_800130-Kartoffeldaempfer--Futterdaempfer-200-Liter--verzinkt.html')

[XT SQL Error]