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', '72qlt7humns96nbpdf8qr623k0', '216.73.216.89', '1766813076', '1766813076', '/index.php?cat=c55_Keramik-fuer-die-Kueche.html')

[XT SQL Error]