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', '4b92faad1c98682424c82a20ba8192c8', '216.73.216.198', '1752878403', '1752878403', '/index.php/cat/c35_Countries.html/page/3')

[XT SQL Error]