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', 'ff74703d851174cde4ebcc08e3808249', '3.17.6.75', '1713529181', '1713529181', '/index.php')

[XT SQL Error]