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', 'nq5pf5ju0tgi6tb8tlg4j8lnc6', '216.73.216.31', '1769474708', '1769474708', '/shop_content.php?coID=5')

[XT SQL Error]