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', 'd1ldsrcf5uc3vna0s3vfmk99g4', '216.73.216.9', '1758228766', '1758228766', '/product_info.php?info=p495_804480-Futterdaempfer-100-Liter-farblich-beschichtet.html')

[XT SQL Error]