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', '5521f52fe98691f58ed37e16cf7caeed', '44.200.179.138', '1711641493', '1711641493', '/index.php')

[XT SQL Error]