1366 - Incorrect integer value: '' for column `pella-ware`.`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', '2a3d220cbe0a32063f9d80fcbb5fd83c', '216.73.217.140', '1781038580', '1781038580', '/shop_content.php?coID=8')

[XT SQL Error]