1366 - Incorrect integer value: '' for column `hbl_shop`.`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', 'u9jvhkdc206fk1nu8sb9i2ep81', '216.73.216.130', '1760924823', '1760924823', '/index.php?cat=c6_Fuer-Haus-und-Garten.html&page=2')

[XT SQL Error]