1366 - Incorrect integer value: '' for column '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', '6jj8ed1ujecvkmkg1ocs6gpdo5', '216.73.217.69', '1790406859', '1790406859', '/xtshop/product_info.php?info=p1008_.html')

[XT SQL Error]