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', '9317bbfe99342ebd5c9d48d1f5a0c9b8', '216.73.216.3', '1766742507', '1766742507', '/index.php/language/de/cat/c30_Countries.html/page/5')

[XT SQL Error]