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', 'cnvs3ri7gefucn6k74nmbn3n32', '2600:1f28:365:80b0:c194:b839:e83b:1206', '1779228433', '1779228433', '/')

[XT SQL Error]