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', 'khqeoh5mrmlcfkciv4m7mb8m23', '3.227.2.246', '1580267465', '1580267465', '/')

[XT SQL Error]