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', 'fig5f84tugs6vjt0rcqqeo08c0', '18.97.9.169', '1752166043', '1752166043', '/')

[XT SQL Error]