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', 'qpf15ki8jok37r2uqrtn5bgkf6', '216.73.216.121', '1761720293', '1761720293', '/product_info.php?XTCsid=38717c4dd62e88001622b2c7b8b8372a&info=p5_Large-Garland-33-feet.html')

[XT SQL Error]