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', 't49ik2kvkk4s50k9h6q1aetu52', '216.73.216.71', '1752612441', '1752612441', '/shop_content.php/coID/103/product/Jockel')

[XT SQL Error]