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', '9ef15d2fb67dbd716aa7d81a8a6adf0f', '98.81.24.230', '1726374889', '1726374889', '/index.php?refID=2')

[XT SQL Error]