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', '4nc92gho65giukv9e4i5l3g3m7', '216.73.216.47', '1758181618', '1758181618', '/product_info.php?info=p585_Katalog-HBL-Landgeraete.html')

[XT SQL Error]