Iterations page: shows exception in GetWorkItemsRemovedFromIteration

Some environments can cause that some fields are missing in API data return from TFS. And this missing fields can cause exception like one below on Iterations page:

at method: GetWorkItemsRemovedFromIteration 
Message: Object reference not set to an instance of an object.

StackTrace: 
at TimetrackerOnline.JointCodebase.BusinessLayer.Context.Services.IterationBacklogService.GetWorkItemsRemovedFromIteration(IterationBacklogModel iteration, WorkItemResult existingWorkItems, ProcessSettingsModel settings, BacklogParameters parameters, VsoTokenModel tokenModel) in C:\BuildAgent\_work\13\s\TimetrackerOnline\TimetrackerOnline.BusinessLayer\Context\Services\IterationBacklogService.cs:line 407 
at TimetrackerOnline.JointCodebase.BusinessLayer.Context.Services.IterationBacklogService.GetBacklogItemTree(VsoTokenModel tokenModel, BacklogParameters parameters, ProcessSettingsModel settings) in C:\BuildAgent\_work\13\s\TimetrackerOnline\TimetrackerOnline.BusinessLayer\Context\Services\IterationBacklogService.cs:line 193 
at TimetrackerOnline.JointCodebase.BusinessLayer.Context.Services.IterationBacklogService.GetBacklog(VsoTokenModel tokenModel, BacklogParameters parameters) in C:\BuildAgent\_work\13\s\TimetrackerOnline\TimetrackerOnline.BusinessLayer\Context\Services\IterationBacklogService.cs:line 116 
at TimetrackerOnline.Controllers.IterationsController.GetBacklog(String urlHash, Guid teamId, Guid projectId, Boolean iterationDatesFilterOn, Boolean movedItemsFilterOn) in C:\BuildAgent\_work\13\s\TimetrackerOnline\TimetrackerOnline.Web\Controllers\IterationsController.cs:line 89 
at lambda_method(Closure , ControllerBase , Object[] ) 
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) 
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) 
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()

Please follow this issue if you are affected.

Affected versions:
<=3.0.7.11679