1366 - Incorrect integer value: '' for column `usr_web74_1`.`whos_online`.`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', '7p2qvtd7rs9vkg8ov9ihd1mvj4', '216.73.216.16', '1758161688', '1758161688', '/shop_content.php?coID=0')

[XT SQL Error]