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', 'kfklbm7a0qh6hb80o08cj4u575', '216.73.216.9', '1758108274', '1758108274', '/product_info.php?XTCsid=f6e58886be8011b1d9a8e232c116cb7a&info=p5_Large-Garland-33-feet.html')

[XT SQL Error]