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', 'd6a6cef33ab9dbd73d285485f82c324f', '18.204.56.185', '1659980017', '1659980017', '/index.php?refID=2')

[XT SQL Error]