for anyone having this issue all you need to do is to right click on the serverquery.j and edit it. there you will have something like name: 'interval' and you will have to playe a comma after it like so: name: 'interval',
2019-04-25T14:55:10+02:00 no valid script found in ServerQuery.js
2019-04-25T14:55:10+02:00 error in script: Uncaught exception: SyntaxError: Unexpected identifier at ServerQuery.js:8:8 title: 'Update Interval in minutes', ^^^^^ Stack trace: SyntaxError: Unexpected identifier