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', '18b76f2ffcaf7bad9ea4088d3bdcd861', '3.236.209.138', '1680338385', '1680338385', '/index.php?refID=2')

[XT SQL Error]