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', '64a748d917ead21a76d52ae94632335e', '216.73.216.126', '1751419221', '1751419221', '/index.php/language/de/cat/c40_Karten-Konfigurator.html')

[XT SQL Error]