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', 'gupis1skut1pep5fnpjqraakk6', '216.73.216.47', '1758082295', '1758082295', '/product_info.php?info=p153_405755-Pfostentraeger-Dorn-zum-Einbetonieren-hoehenverstellbar-100.html')

[XT SQL Error]