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', 'c64588e02163b42c967f37274e10e714', '216.73.216.121', '1751589737', '1751589737', '/index.php?refID=2')

[XT SQL Error]