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', 'sjqrg7b9rno3n04ns37ks4nsl7', '216.73.216.9', '1758125765', '1758125765', '/product_info.php?XTCsid=2f0d32e80e0e3a7e9efdd2dc2a571c8d&info=p6_100-Paper-Plates.html')

[XT SQL Error]