Game User Settings Error

I want to get the min scale value from ResolutionScaleInformation to set something.
But when i use the GetResolutionScaleInformation(), i always get a INF.
Can anyone help me?

This is a known bug (which im also having!) which hasnt been fixed since Jan '17.

Please see here: Unreal Engine Issues and Bug Tracker (UE-39463)
and here: https://answers.unrealengine.com/questions/531294/resolution-scaling-bug.html