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', 'tk380qlde9v9h93255pm8n6uo3', '3.235.66.217', '1585418420', '1585418420', '/')

[XT SQL Error]