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', '0ukqgmg3cn3jma6o0bhe2hse75', '216.73.216.31', '1775045199', '1775045199', '/product_info.php?XTCsid=1455d70b156c4853db961f68b595bbe7&info=p7_Garland-13-feet.html')

[XT SQL Error]