Index: Core/Common/src/Core.Common.Gui/Forms/ViewHost/DocumentViewController.cs
===================================================================
diff -u -rf8f60a1f81812c31026cdb2bcda40e70cfc3d434 -r14eb03902afe5824f6b8df46a6653a05eab228b0
--- Core/Common/src/Core.Common.Gui/Forms/ViewHost/DocumentViewController.cs	(.../DocumentViewController.cs)	(revision f8f60a1f81812c31026cdb2bcda40e70cfc3d434)
+++ Core/Common/src/Core.Common.Gui/Forms/ViewHost/DocumentViewController.cs	(.../DocumentViewController.cs)	(revision 14eb03902afe5824f6b8df46a6653a05eab228b0)
@@ -117,7 +117,7 @@
                 return;
             }
 
-            foreach (var view in viewHost.DocumentViews.Where(view => ShouldRemoveViewForData(view, data))) 
+            foreach (var view in viewHost.DocumentViews.Where(view => ShouldRemoveViewForData(view, data)).ToArray()) 
             {
                 viewHost.Remove(view);
             }