diff -r 5f8d275750e7 -r 644e3cd48034 client/src/Iri.Modernisation.Controls/ViewModel/ConsultationBookView/ConsultationBookViewVM.cs
--- a/client/src/Iri.Modernisation.Controls/ViewModel/ConsultationBookView/ConsultationBookViewVM.cs	Fri Jan 08 11:33:24 2010 +0100
+++ b/client/src/Iri.Modernisation.Controls/ViewModel/ConsultationBookView/ConsultationBookViewVM.cs	Thu Jan 14 16:39:50 2010 +0100
@@ -305,7 +305,7 @@
             _title = param.SelectedBook.Title;
             _author = param.SelectedBook.Author;
             _chapters = param.SelectedBook.Chapters;
-            //
+           
             if (param.SelectedBook.Chapters[0].VideoSequences.Count != 0)
             {
                 ActualVideoSourceVM = new VideoViewerVM(true,false) { Source = param.SelectedBook.MediaPath }; 
@@ -323,17 +323,20 @@
 
         private void ActualVideoSourceVM_Tick(object sender, VideoViewerVMEventArgs e)
         {
-            TimeSpan Pos = e.Position; 
-            SelectedBookVM.Position = Pos.TotalMilliseconds;
-            if (SelectedIndex.TimerOut < Pos || SelectedIndex.TimerIn > Pos)
+            if(SelectedBook!=null)
             {
-                foreach (SegmentIndex Index in SelectedIndex.Chapter.Index)
+                TimeSpan Pos = e.Position; 
+                SelectedBookVM.Position = Pos.TotalMilliseconds;
+                if (SelectedIndex.TimerOut < Pos || SelectedIndex.TimerIn > Pos)
                 {
-                    if (Index.TimerIn <= Pos && Index.TimerOut >= Pos)
+                    foreach (SegmentIndex Index in SelectedIndex.Chapter.Index)
                     {
-                        SelectedIndex = Index;
+                        if (Index.TimerIn <= Pos && Index.TimerOut >= Pos)
+                        {
+                            SelectedIndex = Index;
+                        }
+
                     }
-
                 }
             }
         }