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', 'dcc2c317bfe4b472647d8670929c9532', '18.191.240.243', '1713965305', '1713965305', '/index.php')

[XT SQL Error]