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', 'velrsrtep3p8vi6al2tgloiau5', '216.73.216.31', '1769454776', '1769454776', '/product_info.php?info=p608_804688-Hand-Knochenquetsche.html')

[XT SQL Error]