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', 'udck959p7og6a6kj5bjsnndb32', '216.73.216.143', '1763694679', '1763694679', '/index.php?cat=c5137_Schilder.html')

[XT SQL Error]