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', '19d4jt331m6pcgpra0a0io2ec2', '216.73.216.89', '1760853284', '1760853284', '/xtshop/index.php?cat=c48_.html')

[XT SQL Error]