Index: OpenSceneGraph/trunk/examples/osgviewerWX/osgviewerWX.cpp
===================================================================
--- OpenSceneGraph/trunk/examples/osgviewerWX/osgviewerWX.cpp (revision 12814)
+++ OpenSceneGraph/trunk/examples/osgviewerWX/osgviewerWX.cpp (revision 13130)
@@ -300,5 +300,5 @@
         getState()->setGraphicsContext(this);
 
-        if (_traits.valid() && _traits->sharedContext)
+        if (_traits.valid() && _traits->sharedContext.valid())
         {
             getState()->setContextID( _traits->sharedContext->getState()->getContextID() );