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', '16ff9d5d37790ae9ec5cfb17ca1d1a1e', '18.222.92.56', '1732182084', '1732182084', '/index.php/cat/c44_3D-Karten.html?refID=2')

[XT SQL Error]