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', 'ss7dsq6ihh32s4oageafprad10', '216.73.216.130', '1760864339', '1760864339', '/product_info.php?XTCsid=ec23ca965190a8290c666be9c9947acd&info=p7_Garland-13-feet.html')

[XT SQL Error]