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', 'u6mo60o37h5sp8j0epi3i5h307', '216.73.216.89', '1766322399', '1766322399', '/popup_content.php?coID=1')

[XT SQL Error]