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', '84ca8687c30f8a06211f91666b455353', '3.141.2.96', '1714119561', '1714119561', '/index.php')

[XT SQL Error]