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', 'fhklhha2f613hhgvo6me199pp6', '216.73.216.112', '1761553868', '1761553868', '/product_info.php?info=p608_804688-Hand-Knochenquetsche.html')

[XT SQL Error]