I'm not sure if this error is related to uTwit, Archetype or the site I'm working on but I am getting an Object reference not set to an instance of an object error with uTwit's property value convertor.

Debugging the code it seems that the PublishedPropertyType being passed into IsConvertor is of type Object so it doesn't have he PropertyEditorAlias property which is being checked.

This is the stack trace for the error

[NullReferenceException: Object reference not set to an instance of an object.]
   Our.Umbraco.uTwit.Converters.uTwitPropertyValueConverter.IsConverter(PublishedPropertyType propertyType) +81
   System.Linq.WhereEnumerableIterator`1.MoveNext() +155
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +519
   System.Linq.Enumerable.ToArray(IEnumerable`1 source) +102
   Umbraco.Core.Models.PublishedContent.PublishedPropertyType.InitializeConverters() +216
   Archetype.Extensions.ArchetypePropertyModelExtensions.CreateDummyPropertyType(ArchetypePropertyModel prop) +316
   Archetype.Models.ArchetypePropertyModel.TryConvertWithPropertyValueConverters(Object value, IEnumerable`1 converters) +354
   Archetype.Models.ArchetypePropertyModel.GetValue() +503
   Archetype.Models.ArchetypeFieldsetModel.GetValue(String propertyAlias) +272
   Momenta.Controllers.SocialLinksSurfaceController.Index() in p:\BGNM201_Momenta_Website_230813\solution\Momenta\Controllers\SocialLinksSurfaceController.cs:30
   lambda_method(Closure , ControllerBase , Object[] ) +78
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +273
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +38
   System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +119
   System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +452
   System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +452
   System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +452
   System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +15
   System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +33
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +240
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +28
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +15
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +15
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +15
   System.Web.Mvc.<>c__DisplayClass4.<Wrap>b__3() +15
   System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Func`1 func) +41
   System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +1783

As it mentions Archetype I thought the error was some issue between uTwit and Archetype however wih the debug showing object being passed in I am wondering now whether there is an issue with the site itself.

Does anyone know what is causing this object to be passed to IsConvertor and how I can fix it.