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', '70a9f55f6bc15e42851b9811eca17ed7', '216.73.217.140', '1781038123', '1781038123', '/shop_content.php?coID=1')

[XT SQL Error]