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', 'afa994c455fbfee00f58f3af2af548fc', '3.141.31.240', '1713560336', '1713560336', '/index.php')

[XT SQL Error]