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', '46qnil4o2obcgs3uq4jbn5md22', '216.73.216.141', '1751422446', '1751422446', '/product_info.php?info=p7_Garland-13-feet.html&XTCsid=ca28ab8f46bb6e791b42fe9b92719761')

[XT SQL Error]