[Graph.RBAC] JsonSerializationException on ListMember on AD Group

Hi,

I just upgraded this package from 1.8.0 to 1.11.1 and when running I get this exception on executing ListMembers on a AD Group.

Newtonsoft.Json.JsonSerializationException
  HResult=0x80131500
  Message=Error setting value in extension data for type 'Microsoft.Azure.Management.Graph.RBAC.Fluent.Models.ServicePrincipalInner'. Path 'homepage', line 1, position 996.
  Source=Newtonsoft.Json
  StackTrace:
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetExtensionData(JsonObjectContract contract, JsonProperty member, JsonReader reader, String memberName, Object o)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Microsoft.Rest.Serialization.SafeJsonConvert.DeserializeObject[T](String json, JsonSerializerSettings settings)
   at Microsoft.Azure.Management.Graph.RBAC.Fluent.ActiveDirectoryGroupImpl.WrapObjectInner(AADObjectInner inner)
   at Microsoft.Azure.Management.Graph.RBAC.Fluent.ActiveDirectoryGroupImpl.<ListMembers>b__22_3(AADObjectInner t)
   at System.Linq.Enumerable.<>c__DisplayClass7_0`3.<CombineSelectors>b__0(TSource x)
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.String.Join(String separator, IEnumerable`1 values)
   at ConsoleApp2.Program.GetName(IGraphRbacManager manager, String objectId) in C:\Users\RudiLarno\Source\Repos\ConsoleApp2\ConsoleApp2\Program.cs:line 379
   at ConsoleApp2.Program.AuditKeyVaults(IAzure azure, Boolean executeDelete, TraceWriter log) in C:\Users\RudiLarno\Source\Repos\ConsoleApp2\ConsoleApp2\Program.cs:line 331
   at ConsoleApp2.Program.Main(String[] args) in C:\Users\RudiLarno\Source\Repos\ConsoleApp2\ConsoleApp2\Program.cs:line 55

Inner Exception 1:
ArgumentException: An item with the same key has already been added.

Note that when inspecting the AD Group using the Azure Portal UI, there are no duplicate entries as such.

https://github.com/Azure/azure-libraries-for-net/blob/948234d369535b62e3196ae55081e5d82f58efc8/src/ResourceManagement/Graph.RBAC/ActiveDirectoryGroupImpl.cs#L148

[hovsepm]

Release 1.13 is out. Please upgrade your references.

[hovsepm]

fix has been merged. Will be shipped as part of release 1.13.