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', '260d2adce15325e907ad97658919b2ba', '216.73.216.198', '1752878436', '1752878436', '/index.php/language/en/cat/c38_Karten-Konfigurator.html')

[XT SQL Error]