Getting "Operation is not supported on this platform" (Win7 x64, Powershell 6)

[573]

leiningen/bin/lein.ps1

Line 43 in aba4502

if(!([Net.WebRequest]::DefaultWebProxy.IsBypassed('https://github.com/')))

Exception calling "IsBypassed" with "1" argument(s): "Operation is not supported
on this platform."
At C:\Users\me\Downloads\lein.ps1:43 char:8
+ if(!([Net.WebRequest]::DefaultWebProxy.IsBypassed('https://github ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : PlatformNotSupportedException

Commenting out the concerning if-Block works around it, when there is no proxy in use...