1366 - Incorrect integer value: '' for column `abtecsho_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', '9npatugqjju9uio32jjtnl5h24', '216.73.216.181', '1752112134', '1752112134', '/index.php/cat/c134_Gebotszeichen.html')

[XT SQL Error]