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', '95i3n6uprikcj3jog3eqr3jku7', '216.73.216.80', '1751322260', '1751322260', '/product_info.php?info=p17_20-Tissue-Napkins.html&XTCsid=a0c8d0b3d08cb472c84559a313755d47')

[XT SQL Error]