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', '97aadtn00loh4m1ajv5raqfvu1', '216.73.216.9', '1758029039', '1758029039', '/product_info.php?XTCsid=0308d34f52db367f9a7068f51bec2a23&info=p5_Large-Garland-33-feet.html')

[XT SQL Error]