Fix renderer cloning in vector layer when it's null

src/core/qgsvectorlayer.cpp

@@ -219,11 +219,15 @@ QgsVectorLayer *QgsVectorLayer::clone() const
   layer->selectByIds( selectedFeatureIds() );
   layer->setExcludeAttributesWms( excludeAttributesWms() );
   layer->setExcludeAttributesWfs( excludeAttributesWfs() );
-  layer->setRenderer( renderer()->clone() );
   layer->setAttributeTableConfig( attributeTableConfig() );
   layer->setFeatureBlendMode( featureBlendMode() );
   layer->setLayerTransparency( layerTransparency() );
 
+  if ( renderer() )
+  {
+    layer->setRenderer( renderer()->clone() );
+  }
+
   if ( labeling() )
   {
     layer->setLabeling( labeling()->clone() );