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', '8p7q8osq28amn74ptti0pi4772', '216.73.216.3', '1762327286', '1762327286', '/index.php/manufacturers_id/13')

[XT SQL Error]