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', 'lg4a22easam7nlmec4l8g29c65', '216.73.216.223', '1767817990', '1767817990', '/index.php/manufacturers_id/14')

[XT SQL Error]