Error backup Hyper-V

Support
1

Hi,

I get an Error in case of backup Hyper-V (i think since 2.0.4.16):

Failed while executing “Backup” with id: 34

System.ArgumentNullException: Der Wert darf nicht NULL sein. Parametername: s bei System.IO.StringReader…ctor(String s) bei System.Xml.XmlDocument.LoadXml(String xml) bei Duplicati.Library.Snapshots.HyperVUtility.GetVMVhdPathsWMI(String vmID) bei Duplicati.Library.Snapshots.HyperVUtility.QueryHyperVGuestsInfo(Boolean bIncludePaths) bei Duplicati.Library.Modules.Builtin.HyperVOptions.RealParseSourcePaths(String& paths, String& filter, Dictionary2 commandlineOptions) bei Duplicati.Library.Modules.Builtin.HyperVOptions.ParseSourcePaths(String[]& paths, String& filter, Dictionary2 commandlineOptions) bei Duplicati.Library.Main.Controller.SetupCommonOptions(ISetCommonOptions result, String& paths, IFilter& filter) bei Duplicati.Library.Main.Controller.RunAction[T](T result, String& paths, IFilter& filter, Action`1 method) bei Duplicati.Library.Main.Controller.Backup(String inputsources, IFilter filter) bei Duplicati.Server.Runner.Run(IRunnerData data, Boolean fromQueue)
OS: Win10 18.09
Duplicati: 2.0.4.16

With Version 2.0.4.15 everything was OK. I did not change anything at the task while updatimg duplicati. The error happens by backing up to OneDrive and to UNC-Path (Windows) by two different tasks.

2

I made a downgrade to 2.0.4.15.
The error seems not to depend on the version.

Any idea?:
System.ArgumentNullException: Der Wert darf nicht NULL sein. Parametername: s bei System.IO.StringReader…ctor(String s) bei System.Xml.XmlDocument.LoadXml(String xml) bei Duplicati.Library.Snapshots.HyperVUtility.GetVMVhdPathsWMI(String vmID) bei Duplicati.Library.Snapshots.HyperVUtility.QueryHyperVGuestsInfo(Boolean bIncludePaths) bei Duplicati.Library.Modules.Builtin.HyperVOptions.RealParseSourcePaths(String& paths, String& filter, Dictionary2 commandlineOptions) bei Duplicati.Library.Modules.Builtin.HyperVOptions.ParseSourcePaths(String[]& paths, String& filter, Dictionary2 commandlineOptions) bei Duplicati.Library.Main.Controller.SetupCommonOptions(ISetCommonOptions result, String& paths, IFilter& filter) bei Duplicati.Library.Main.Controller.RunAction[T](T result, String& paths, IFilter& filter, Action`1 method) bei Duplicati.Library.Main.Controller.Backup(String inputsources, IFilter filter) bei Duplicati.Server.Runner.Run(IRunnerData data, Boolean fromQueue)

First line in english:
System.ArgumentNullException: The Measure must not be NULL. Parametername: s at System.IO.StringReader

Any idea where to look for the error?