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', '5k2u8pp2e20c7909mobe5kbrb4', '216.73.216.24', '1751412166', '1751412166', '/product_info.php?info=p600_Obst--und-Beerenmuehle.html')

[XT SQL Error]