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', '36337c8d43964bfd1c277a61980fb1ea', '18.191.147.190', '1714129945', '1714129945', '/index.php')

[XT SQL Error]