--- a/Tools__ViewTreeApplication.st	Mon May 11 15:18:41 2015 +0200
+++ b/Tools__ViewTreeApplication.st	Tue May 19 20:36:55 2015 +0200
@@ -2387,6 +2387,8 @@
 rootView
     "returns the widget assigned to the root or nil
     "
+    parent isNil ifTrue:[^ nil].
+
     ^ parent rootView
 !