CVS commit by mueller: 

fix nonreproducible crash


  M +1 -1      layers.cpp   2.43


--- kdebase/kwin/layers.cpp  #2.42:2.43
@@ -713,5 +713,5 @@ Layer Client::belongsToLayer() const
     const Client* ac = workspace()->mostRecentlyActivatedClient(); // instead of activeClient() - avoids flicker
     const Client* top = workspace()->topClientOnDesktop( desktop(), true );
-    if( isFullScreen() && ac != NULL
+    if( isFullScreen() && ac != NULL && top != NULL
         && ( ac == this || this->hasTransient( ac, true ))
         && ( top == this || this->hasTransient( top, true )))