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', 'e90970d114df871a7644f4ccc98b6418', '216.73.217.140', '1781039067', '1781039067', '/shopping_cart.php')

[XT SQL Error]