1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', 'a21c7dec0cec1292b473d3779ff3eb3a', '216.73.216.143', '1762604765', '1762604765', '/index.php/cat/c35_Countries.html/page/2')

[XT SQL Error]