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', 'bdd8d742f75035095d0140d8ffae3231', '216.73.216.35', '1751518723', '1751518723', '/index.php/language/de')

[XT SQL Error]