Exceptions when closing files

Hi all, just wondering if this should be expected on the
trunk. 
Basically for each file I close I get the two exceptions
below...

System.NullReferenceException: Object reference not set to
an instance 
of an object
  at Mono.TextEditor.TextEditor.OnSetScrollAdjustments
(Gtk.Adjustment 
hAdjustement, Gtk.Adjustment vAdjustement) [0x00000]
  at Gtk.Widget.SetScrollAdjustments_cb (IntPtr widget,
IntPtr hadj, 
IntPtr vadj) [0x00000]

then...

System.NullReferenceException: Object reference not set to
an instance 
of an object
  at MonoDevelop.SourceEditor.SourceEditorWidget.KillWidgets
() [0x00000]
  at
MonoDevelop.SourceEditor.SourceEditorWidget.RemoveSearchWidg
et () 
[0x00000]
  at MonoDevelop.SourceEditor.SourceEditorWidget.Dispose ()
[0x00000]
  at MonoDevelop.SourceEditor.SourceEditorView.Dispose ()
[0x00000]
  at MonoDevelop.Ide.Gui.SdiWorkspaceWindow.CloseWindow
(Boolean force, 
Boolean fromMenu, Int32 pageNum) [0x00000]
  at MonoDevelop.Ide.Gui.SdiWorkbenchLayout.closeClicked
(System.Object 
o, System.EventArgs e) [0x00000]
  at MonoDevelop.Components.TabLabel.ButtonClicked
(System.Object o, 
System.EventArgs eventArgs) [0x00000]
  at GLib.Signal.voidObjectCallback (IntPtr handle, IntPtr
gch) [0x00000]

TIA

Patrick
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