1366 - Incorrect integer value: '' for column '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', 'f9a5c636d58faaf5dba740779099a930', '216.73.216.132', '1759481606', '1759481606', '/shop/product_info.php?info=p128_.html')

[XT SQL Error]