System.NullReferenceException in PerfCounterRealTimeProbe.Dispose when counterPaths not valid

[Expecho]

I have a situation in which the Dispose gets called while the Timer is null so the call to _timer.Dispose(); fails in PerfCounterRealTimeProbe.cs . I suggest to check the _timer for a null value before disposing. Shall I create a PR for that?

[Tuatan]

Thanks for reporting the issue, @Expecho ,

Could you please create a PR to develop branch. Thank you!