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', 'l50e3msv1pck359oe69cr9f4h2', '216.73.216.200', '1752904765', '1752904765', '/index.php/cat/images/categories/5248.jpg')

[XT SQL Error]