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', 'ba18mdm8dv7k94gl750m1imk36', '216.73.216.145', '1776427648', '1776427648', '/product_info.php?XTCsid=a63f52844b6e675f480eaf86612536c2&info=p8_100-Placemats.html')

[XT SQL Error]