Merge pull request #213 from robertbaker/patch-2

Fixes: System.InvalidOperationExceptionSequence

Author: martijn00

MvvmCross.Droid.Support.V7.Fragging/Caching/MvxCachingFragmentActivity.cs

@@ -436,10 +436,13 @@ public virtual bool Show(MvxViewModelRequest request, Bundle bundle, Type fragme
 		public virtual bool Close(IMvxViewModel viewModel)
 		{
 			//Workaround for closing fragments. This will not work when showing multiple fragments of the same viewmodel type in one activity
-			var frag = GetCurrentCacheableFragmentsInfo ().First (x => x.ViewModelType == viewModel.GetType());
-			CloseFragment(frag.Tag, frag.ContentId);
-
+			var frag = GetCurrentCacheableFragmentsInfo ().FirstOrDefault (x => x.ViewModelType == viewModel.GetType());
+			if (frag == null)
+			{
+				return false;
+			}
 			// Close method can not be fully fixed at this moment. That requires some changes in main MvvmCross library
+			CloseFragment(frag.Tag, frag.ContentId);
 			return true;
 		}
     }
@@ -454,4 +457,4 @@ public abstract class MvxCachingFragmentActivity<TViewModel>
             set { base.ViewModel = value; }
         }
     }
-}
+}