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', '6btsg1cvs486v977raqe0r6bq4', '3.228.10.17', '1601094111', '1601094111', '/')

[XT SQL Error]