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', 'drglirubiptgdrll6jfo77s3b6', '3.227.254.12', '1569191192', '1569191192', '/')

[XT SQL Error]