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', '66652832f1cc4e8eb10a894ff1055549', '3.22.249.158', '1713629457', '1713629457', '/index.php/language/de/refID/2')

[XT SQL Error]