1366 - Incorrect integer value: '' for column `mapshopatlogis`.`whos_online`.`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', '87afc14d80d9347e76eba57a09a86aa3', '3.137.198.143', '1732173615', '1732173615', '/index.php?refID=2')

[XT SQL Error]