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', '6eb0bru2h6btg8ils9hogeic73', '18.204.227.117', '1590567150', '1590567150', '/')

[XT SQL Error]