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', '725bea0b92f30da629a61d989b15c75c', '216.73.217.140', '1781038356', '1781038356', '/shop_content.php?coID=3')

[XT SQL Error]