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', '9196131a41a2ed93d54ce53497cfdeba', '3.131.13.194', '1714194040', '1714194040', '/index.php')

[XT SQL Error]