diff --git a/src/app/qgsfieldsproperties.cpp b/src/app/qgsfieldsproperties.cpp
index 57348d51bfa1..5a15c6c3862f 100644
--- a/src/app/qgsfieldsproperties.cpp
+++ b/src/app/qgsfieldsproperties.cpp
@@ -165,6 +165,10 @@ QTreeWidgetItem *QgsFieldsProperties::loadAttributeEditorTreeItem( QgsAttributeE
       newWidget = mDesignerTree->addItem( parent, DesignerTreeItemData( DesignerTreeItemData::Container, widgetDef->name() ) );
 
       const QgsAttributeEditorContainer* container = dynamic_cast<const QgsAttributeEditorContainer*>( widgetDef );
+      if ( !container )
+      {
+        break;
+      }
 
       Q_FOREACH ( QgsAttributeEditorElement* wdg, container->children() )
       {
diff --git a/src/core/dxf/qgsdxfexport.cpp b/src/core/dxf/qgsdxfexport.cpp
index 6227f878a3c8..b7055db21137 100644
--- a/src/core/dxf/qgsdxfexport.cpp
+++ b/src/core/dxf/qgsdxfexport.cpp
@@ -3224,7 +3224,7 @@ void QgsDxfExport::writePoint( const QgsPoint& pt, const QString& layer, QColor
   {
     //write symbol directly here
     const QgsMarkerSymbolLayerV2* msl = dynamic_cast< const QgsMarkerSymbolLayerV2* >( symbolLayer );
-    if ( symbolLayer && symbol )
+    if ( msl && symbol )
     {
       QgsRenderContext ct;
       QgsSymbolV2RenderContext ctx( ct, QgsSymbolV2::MapUnit, symbol->alpha(), false, symbol->renderHints(), f );
diff --git a/src/core/dxf/qgsdxfpallabeling.cpp b/src/core/dxf/qgsdxfpallabeling.cpp
index 8f58a7fe78cb..fdfcef56ae9a 100644
--- a/src/core/dxf/qgsdxfpallabeling.cpp
+++ b/src/core/dxf/qgsdxfpallabeling.cpp
@@ -75,6 +75,8 @@ void QgsDxfPalLabeling::drawLabel( pal::LabelPosition* label, QgsRenderContext&
   if ( mDxfExport )
   {
     QgsPalGeometry *g = dynamic_cast< QgsPalGeometry* >( label->getFeaturePart()->getUserGeometry() );
+    if ( !g )
+      return;
 
     //label text
     QString text = g->text();
diff --git a/src/core/layertree/qgslayertreemodel.cpp b/src/core/layertree/qgslayertreemodel.cpp
index a8da647d5e19..708b762042e9 100644
--- a/src/core/layertree/qgslayertreemodel.cpp
+++ b/src/core/layertree/qgslayertreemodel.cpp
@@ -194,15 +194,13 @@ QVariant QgsLayerTreeModel::data( const QModelIndex &index, int role ) const
           QgsRasterLayer* rlayer = qobject_cast<QgsRasterLayer *>( layer );
           return QIcon( rlayer->previewAsPixmap( QSize( 32, 32 ) ) );
         }
+        else
+        {
+          return QgsLayerItem::iconRaster();
+        }
       }
 
       QgsVectorLayer *vlayer = dynamic_cast<QgsVectorLayer*>( layer );
-
-      if ( layer->type() == QgsMapLayer::RasterLayer )
-      {
-        return QgsLayerItem::iconRaster();
-      }
-
       QIcon icon;
 
       // if there's just on legend entry that should be embedded in layer - do that!
@@ -210,7 +208,7 @@ QVariant QgsLayerTreeModel::data( const QModelIndex &index, int role ) const
       {
         icon = legendIconEmbeddedInParent( nodeLayer );
       }
-      else if ( layer->type() == QgsMapLayer::VectorLayer )
+      else if ( vlayer && layer->type() == QgsMapLayer::VectorLayer )
       {
         if ( vlayer->geometryType() == QGis::Point )
           icon = QgsLayerItem::iconPoint();
diff --git a/src/core/qgsdataitem.cpp b/src/core/qgsdataitem.cpp
index c660f8d41cd8..47a793cb34d5 100644
--- a/src/core/qgsdataitem.cpp
+++ b/src/core/qgsdataitem.cpp
@@ -659,6 +659,9 @@ bool QgsLayerItem::equal( const QgsDataItem *other )
   }
   //const QgsLayerItem *o = qobject_cast<const QgsLayerItem *> ( other );
   const QgsLayerItem *o = dynamic_cast<const QgsLayerItem *>( other );
+  if ( !o )
+    return false;
+
   return ( mPath == o->mPath && mName == o->mName && mUri == o->mUri && mProviderKey == o->mProviderKey );
 }
 
diff --git a/src/core/qgspointlocator.cpp b/src/core/qgspointlocator.cpp
index 94f58a943f45..6bb9d97d7cbc 100644
--- a/src/core/qgspointlocator.cpp
+++ b/src/core/qgspointlocator.cpp
@@ -529,6 +529,9 @@ class QgsPointLocator_DumpTree : public SpatialIndex::IQueryStrategy
     void getNextEntry( const IEntry& entry, id_type& nextEntry, bool& hasNext ) override
     {
       const INode* n = dynamic_cast<const INode*>( &entry );
+      if ( !n )
+        return;
+
       qDebug( "NODE: %ld", n->getIdentifier() );
       if ( n->getLevel() > 0 )
       {
diff --git a/src/core/symbology-ng/qgscptcityarchive.cpp b/src/core/symbology-ng/qgscptcityarchive.cpp
index 8883b92e3e30..b50cd8e55864 100644
--- a/src/core/symbology-ng/qgscptcityarchive.cpp
+++ b/src/core/symbology-ng/qgscptcityarchive.cpp
@@ -1531,15 +1531,18 @@ QModelIndex QgsCptCityBrowserModel::findPath( QString path )
       if ( item->type() == QgsCptCityDataItem::Selection )
       {
         const QgsCptCitySelectionItem* selItem = dynamic_cast<const QgsCptCitySelectionItem *>( item );
-        foreach ( QString childPath, selItem->selectionsList() )
+        if ( selItem )
         {
-          if ( childPath.endsWith( "/" ) )
-            childPath.chop( 1 );
-          // QgsDebugMsg( "childPath= " + childPath );
-          if ( path.startsWith( childPath ) )
+          foreach ( QString childPath, selItem->selectionsList() )
           {
-            foundParent = true;
-            break;
+            if ( childPath.endsWith( "/" ) )
+              childPath.chop( 1 );
+            // QgsDebugMsg( "childPath= " + childPath );
+            if ( path.startsWith( childPath ) )
+            {
+              foundParent = true;
+              break;
+            }
           }
         }
       }
diff --git a/src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp b/src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp
index 829faf95ca4b..71f0169e2fa4 100644
--- a/src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp
+++ b/src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp
@@ -1575,12 +1575,14 @@ QgsGraduatedSymbolRendererV2* QgsGraduatedSymbolRendererV2::convertFromRenderer(
   if ( renderer->type() == "pointDisplacement" )
   {
     const QgsPointDisplacementRenderer* pointDisplacementRenderer = dynamic_cast<const QgsPointDisplacementRenderer*>( renderer );
-    return convertFromRenderer( pointDisplacementRenderer->embeddedRenderer() );
+    if ( pointDisplacementRenderer )
+      return convertFromRenderer( pointDisplacementRenderer->embeddedRenderer() );
   }
   if ( renderer->type() == "invertedPolygonRenderer" )
   {
     const QgsInvertedPolygonRenderer* invertedPolygonRenderer = dynamic_cast<const QgsInvertedPolygonRenderer*>( renderer );
-    return convertFromRenderer( invertedPolygonRenderer->embeddedRenderer() );
+    if ( invertedPolygonRenderer )
+      return convertFromRenderer( invertedPolygonRenderer->embeddedRenderer() );
   }
 
   // If not one of the specifically handled renderers, then just grab the symbol from the renderer
diff --git a/src/core/symbology-ng/qgsrulebasedrendererv2.cpp b/src/core/symbology-ng/qgsrulebasedrendererv2.cpp
index ef506890a0da..f12964f30fe3 100644
--- a/src/core/symbology-ng/qgsrulebasedrendererv2.cpp
+++ b/src/core/symbology-ng/qgsrulebasedrendererv2.cpp
@@ -1081,6 +1081,9 @@ QgsRuleBasedRendererV2* QgsRuleBasedRendererV2::convertFromRenderer( const QgsFe
   if ( renderer->type() == "singleSymbol" )
   {
     const QgsSingleSymbolRendererV2* singleSymbolRenderer = dynamic_cast<const QgsSingleSymbolRendererV2*>( renderer );
+    if ( !singleSymbolRenderer )
+      return 0;
+
     QgsSymbolV2* origSymbol = singleSymbolRenderer->symbol()->clone();
     convertToDataDefinedSymbology( origSymbol, singleSymbolRenderer->sizeScaleField(), singleSymbolRenderer->rotationField() );
     return new QgsRuleBasedRendererV2( origSymbol );
@@ -1141,6 +1144,8 @@ QgsRuleBasedRendererV2* QgsRuleBasedRendererV2::convertFromRenderer( const QgsFe
   {
 
     const QgsGraduatedSymbolRendererV2* graduatedRenderer = dynamic_cast<const QgsGraduatedSymbolRendererV2*>( renderer );
+    if ( !graduatedRenderer )
+      return 0;
 
     QgsRuleBasedRendererV2::Rule* rootrule = new QgsRuleBasedRendererV2::Rule( NULL );
 
@@ -1181,12 +1186,14 @@ QgsRuleBasedRendererV2* QgsRuleBasedRendererV2::convertFromRenderer( const QgsFe
   if ( renderer->type() == "pointDisplacement" )
   {
     const QgsPointDisplacementRenderer* pointDisplacementRenderer = dynamic_cast<const QgsPointDisplacementRenderer*>( renderer );
-    return convertFromRenderer( pointDisplacementRenderer->embeddedRenderer() );
+    if ( pointDisplacementRenderer )
+      return convertFromRenderer( pointDisplacementRenderer->embeddedRenderer() );
   }
   if ( renderer->type() == "invertedPolygonRenderer" )
   {
     const QgsInvertedPolygonRenderer* invertedPolygonRenderer = dynamic_cast<const QgsInvertedPolygonRenderer*>( renderer );
-    return convertFromRenderer( invertedPolygonRenderer->embeddedRenderer() );
+    if ( invertedPolygonRenderer )
+      return convertFromRenderer( invertedPolygonRenderer->embeddedRenderer() );
   }
 
   return NULL;
diff --git a/src/core/symbology-ng/qgssinglesymbolrendererv2.cpp b/src/core/symbology-ng/qgssinglesymbolrendererv2.cpp
index e5f497d0ea83..9381b9e1a71b 100644
--- a/src/core/symbology-ng/qgssinglesymbolrendererv2.cpp
+++ b/src/core/symbology-ng/qgssinglesymbolrendererv2.cpp
@@ -392,13 +392,14 @@ QgsSingleSymbolRendererV2* QgsSingleSymbolRendererV2::convertFromRenderer( const
   if ( renderer->type() == "pointDisplacement" )
   {
     const QgsPointDisplacementRenderer* pointDisplacementRenderer = dynamic_cast<const QgsPointDisplacementRenderer*>( renderer );
-    return convertFromRenderer( pointDisplacementRenderer->embeddedRenderer() );
+    if ( pointDisplacementRenderer )
+      return convertFromRenderer( pointDisplacementRenderer->embeddedRenderer() );
   }
   if ( renderer->type() == "invertedPolygonRenderer" )
   {
     const QgsInvertedPolygonRenderer* invertedPolygonRenderer = dynamic_cast<const QgsInvertedPolygonRenderer*>( renderer );
-    return convertFromRenderer( invertedPolygonRenderer->embeddedRenderer() );
-
+    if ( invertedPolygonRenderer )
+      return convertFromRenderer( invertedPolygonRenderer->embeddedRenderer() );
   }
 
   QgsSymbolV2List symbols = const_cast<QgsFeatureRendererV2 *>( renderer )->symbols();
diff --git a/src/gui/qgsattributeform.cpp b/src/gui/qgsattributeform.cpp
index 66c2d791de18..7ee1c3cc41a0 100644
--- a/src/gui/qgsattributeform.cpp
+++ b/src/gui/qgsattributeform.cpp
@@ -386,6 +386,9 @@ void QgsAttributeForm::init()
       if ( widgDef->type() == QgsAttributeEditorElement::AeTypeContainer )
       {
         QgsAttributeEditorContainer* containerDef = dynamic_cast<QgsAttributeEditorContainer*>( widgDef );
+        if ( !containerDef )
+          continue;
+
         containerDef->setIsGroupBox( false ); // Toplevel widgets are tabs not groupboxes
         QString dummy1;
         bool dummy2;
@@ -565,6 +568,9 @@ QWidget* QgsAttributeForm::createWidgetFromDef( const QgsAttributeEditorElement
     case QgsAttributeEditorElement::AeTypeField:
     {
       const QgsAttributeEditorField* fieldDef = dynamic_cast<const QgsAttributeEditorField*>( widgetDef );
+      if ( !fieldDef )
+        break;
+
       int fldIdx = fieldDef->idx();
       if ( fldIdx < vl->pendingFields().count() && fldIdx >= 0 )
       {
@@ -600,8 +606,10 @@ QWidget* QgsAttributeForm::createWidgetFromDef( const QgsAttributeEditorElement
     case QgsAttributeEditorElement::AeTypeContainer:
     {
       const QgsAttributeEditorContainer* container = dynamic_cast<const QgsAttributeEditorContainer*>( widgetDef );
-      QWidget* myContainer;
+      if ( !container )
+        break;
 
+      QWidget* myContainer;
       if ( container->isGroupBox() )
       {
         QGroupBox* groupBox = new QGroupBox( parent );
@@ -760,7 +768,7 @@ bool QgsAttributeForm::eventFilter( QObject* object, QEvent* e )
   if ( e->type() == QEvent::KeyPress )
   {
     QKeyEvent* keyEvent = dynamic_cast<QKeyEvent*>( e );
-    if ( keyEvent->key() == Qt::Key_Escape )
+    if ( keyEvent && keyEvent->key() == Qt::Key_Escape )
     {
       // Re-emit to this form so it will be forwarded to parent
       event( e );
diff --git a/src/gui/qgsexpressionbuilderwidget.cpp b/src/gui/qgsexpressionbuilderwidget.cpp
index 65ea8abb1a37..f7182f577da0 100644
--- a/src/gui/qgsexpressionbuilderwidget.cpp
+++ b/src/gui/qgsexpressionbuilderwidget.cpp
@@ -565,7 +565,7 @@ void QgsExpressionBuilderWidget::loadSampleValues()
   QgsExpressionItem* item = dynamic_cast<QgsExpressionItem*>( mModel->itemFromIndex( idx ) );
   // TODO We should really return a error the user of the widget that
   // the there is no layer set.
-  if ( !mLayer )
+  if ( !mLayer || !item )
     return;
 
   mValueGroupBox->show();
@@ -580,7 +580,7 @@ void QgsExpressionBuilderWidget::loadAllValues()
   QgsExpressionItem* item = dynamic_cast<QgsExpressionItem*>( mModel->itemFromIndex( idx ) );
   // TODO We should really return a error the user of the widget that
   // the there is no layer set.
-  if ( !mLayer )
+  if ( !mLayer || !item )
     return;
 
   mValueGroupBox->show();
diff --git a/src/gui/qgsfieldexpressionwidget.cpp b/src/gui/qgsfieldexpressionwidget.cpp
index 8057d9a9af26..cba0add6bdbd 100644
--- a/src/gui/qgsfieldexpressionwidget.cpp
+++ b/src/gui/qgsfieldexpressionwidget.cpp
@@ -71,6 +71,9 @@ void QgsFieldExpressionWidget::setFilters( QgsFieldProxyModel::Filters filters )
 void QgsFieldExpressionWidget::setLeftHandButtonStyle( bool isLeft )
 {
   QHBoxLayout* layout = dynamic_cast<QHBoxLayout*>( this->layout() );
+  if ( !layout )
+    return;
+
   if ( isLeft )
   {
     QLayoutItem* item = layout->takeAt( 1 );
diff --git a/src/gui/symbology-ng/qgsrendererv2widget.cpp b/src/gui/symbology-ng/qgsrendererv2widget.cpp
index cefc3258ad4c..f114422faba5 100644
--- a/src/gui/symbology-ng/qgsrendererv2widget.cpp
+++ b/src/gui/symbology-ng/qgsrendererv2widget.cpp
@@ -129,13 +129,16 @@ void QgsRendererV2Widget::changeSymbolWidth()
   }
 
   bool ok;
-  double width = QInputDialog::getDouble( this, tr( "Width" ), tr( "Change symbol width" ), dynamic_cast<QgsLineSymbolV2*>( symbolList.at( 0 ) )->width(), 0.0, 999999, 1, &ok );
+  QgsLineSymbolV2* line = dynamic_cast<QgsLineSymbolV2*>( symbolList.at( 0 ) ) ;
+  double width = QInputDialog::getDouble( this, tr( "Width" ), tr( "Change symbol width" ), line ? line->width() : 0.0 , 0.0, 999999, 1, &ok );
   if ( ok )
   {
     QList<QgsSymbolV2*>::iterator symbolIt = symbolList.begin();
     for ( ; symbolIt != symbolList.end(); ++symbolIt )
     {
-      dynamic_cast<QgsLineSymbolV2*>( *symbolIt )->setWidth( width );
+      line = dynamic_cast<QgsLineSymbolV2*>( *symbolIt );
+      if ( line )
+        line->setWidth( width );
     }
     refreshSymbolView();
   }
@@ -150,13 +153,17 @@ void QgsRendererV2Widget::changeSymbolSize()
   }
 
   bool ok;
-  double size = QInputDialog::getDouble( this, tr( "Size" ), tr( "Change symbol size" ), dynamic_cast<QgsMarkerSymbolV2*>( symbolList.at( 0 ) )->size(), 0.0, 999999, 1, &ok );
+  QgsMarkerSymbolV2* marker = dynamic_cast<QgsMarkerSymbolV2*>( symbolList.at( 0 ) );
+
+  double size = QInputDialog::getDouble( this, tr( "Size" ), tr( "Change symbol size" ), marker ? marker->size() : 0.0 , 0.0, 999999, 1, &ok );
   if ( ok )
   {
     QList<QgsSymbolV2*>::iterator symbolIt = symbolList.begin();
     for ( ; symbolIt != symbolList.end(); ++symbolIt )
     {
-      dynamic_cast<QgsMarkerSymbolV2*>( *symbolIt )->setSize( size );
+      marker = dynamic_cast<QgsMarkerSymbolV2*>( *symbolIt );
+      if ( marker )
+        marker->setSize( size );
     }
     refreshSymbolView();
   }
diff --git a/src/plugins/georeferencer/qgsgeoreftransform.cpp b/src/plugins/georeferencer/qgsgeoreftransform.cpp
index 6ed6e9cadc9b..34e76083f842 100644
--- a/src/plugins/georeferencer/qgsgeoreftransform.cpp
+++ b/src/plugins/georeferencer/qgsgeoreftransform.cpp
@@ -303,12 +303,14 @@ bool QgsGeorefTransform::getOriginScaleRotation( QgsPoint &origin, double &scale
   if ( mTransformParametrisation == Linear )
   {
     rotation = 0.0;
-    return dynamic_cast<QgsLinearGeorefTransform *>( mGeorefTransformImplementation )->getOriginScale( origin, scaleX, scaleY );
+    QgsLinearGeorefTransform* transform = dynamic_cast<QgsLinearGeorefTransform *>( mGeorefTransformImplementation );
+    return transform && transform->getOriginScale( origin, scaleX, scaleY );
   }
   else if ( mTransformParametrisation == Helmert )
   {
     double scale;
-    if ( ! dynamic_cast<QgsHelmertGeorefTransform*>( mGeorefTransformImplementation )->getOriginScaleRotation( origin, scale, rotation ) )
+    QgsHelmertGeorefTransform* transform = dynamic_cast<QgsHelmertGeorefTransform*>( mGeorefTransformImplementation );
+    if ( !transform || ! transform->getOriginScaleRotation( origin, scale, rotation ) )
     {
       return false;
     }
diff --git a/src/providers/ows/qgsowsdataitems.cpp b/src/providers/ows/qgsowsdataitems.cpp
index 8dfb3e82eaad..67eedad885af 100644
--- a/src/providers/ows/qgsowsdataitems.cpp
+++ b/src/providers/ows/qgsowsdataitems.cpp
@@ -126,7 +126,7 @@ bool QgsOWSConnectionItem::equal( const QgsDataItem *other )
     return false;
   }
   const QgsOWSConnectionItem *o = dynamic_cast<const QgsOWSConnectionItem *>( other );
-  return ( mPath == o->mPath && mName == o->mName );
+  return ( o && mPath == o->mPath && mName == o->mName );
 }
 
 QList<QAction*> QgsOWSConnectionItem::actions()
diff --git a/tests/src/core/testqgslegendrenderer.cpp b/tests/src/core/testqgslegendrenderer.cpp
index f06199a9bee1..9c8173e1495a 100644
--- a/tests/src/core/testqgslegendrenderer.cpp
+++ b/tests/src/core/testqgslegendrenderer.cpp
@@ -215,7 +215,9 @@ void TestQgsLegendRenderer::testBigMarker()
   QgsMarkerSymbolV2* sym = new QgsMarkerSymbolV2();
   sym->setColor( Qt::red );
   sym->setSize( sym->size() * 6 );
-  dynamic_cast<QgsCategorizedSymbolRendererV2*>( mVL3->rendererV2() )->updateCategorySymbol( 0, sym );
+  QgsCategorizedSymbolRendererV2* catRenderer = dynamic_cast<QgsCategorizedSymbolRendererV2*>( mVL3->rendererV2() );
+  QVERIFY( catRenderer );
+  catRenderer->updateCategorySymbol( 0, sym );
 
   //dynamic_cast<QgsCategorizedSymbolRendererV2*>( mVL3->rendererV2() )->updateCategoryLabel( 2, "This is a long symbol label" );
 
@@ -231,7 +233,9 @@ void TestQgsLegendRenderer::testLongSymbolText()
 {
   QString testName = "legend_long_symbol_text";
 
-  dynamic_cast<QgsCategorizedSymbolRendererV2*>( mVL3->rendererV2() )->updateCategoryLabel( 1, "This is\nthree lines\nlong label" );
+  QgsCategorizedSymbolRendererV2* catRenderer = dynamic_cast<QgsCategorizedSymbolRendererV2*>( mVL3->rendererV2() );
+  QVERIFY( catRenderer );
+  catRenderer->updateCategoryLabel( 1, "This is\nthree lines\nlong label" );
 
   QgsLayerTreeModel legendModel( mRoot );
 
diff --git a/tests/src/core/testqgsmaplayerstylemanager.cpp b/tests/src/core/testqgsmaplayerstylemanager.cpp
index c73c661c74a6..5038d917e690 100644
--- a/tests/src/core/testqgsmaplayerstylemanager.cpp
+++ b/tests/src/core/testqgsmaplayerstylemanager.cpp
@@ -104,6 +104,7 @@ void TestQgsMapLayerStyleManager::testStyle()
 void TestQgsMapLayerStyleManager::testReadWrite()
 {
   QgsSingleSymbolRendererV2* r0 = dynamic_cast<QgsSingleSymbolRendererV2*>( mVL->rendererV2() );
+  QVERIFY( r0 );
   r0->symbol()->setColor( Qt::red );
 
   // create and populate the manager with one more style
@@ -139,17 +140,24 @@ void TestQgsMapLayerStyleManager::testReadWrite()
   sm1.setCurrentStyle( QString() );
 
   QgsSingleSymbolRendererV2* r2 = dynamic_cast<QgsSingleSymbolRendererV2*>( mVL->rendererV2() );
+  QVERIFY( r2 );
   QCOMPARE( r2->symbol()->color(), QColor( Qt::red ) );
 }
 
 static void _setVLColor( QgsVectorLayer* vl, const QColor& c )
 {
-  dynamic_cast<QgsSingleSymbolRendererV2*>( vl->rendererV2() )->symbol()->setColor( c );
+  QgsSingleSymbolRendererV2* renderer = dynamic_cast<QgsSingleSymbolRendererV2*>( vl->rendererV2() );
+  if ( renderer )
+    renderer->symbol()->setColor( c );
 }
 
 static QColor _getVLColor( QgsVectorLayer* vl )
 {
-  return dynamic_cast<QgsSingleSymbolRendererV2*>( vl->rendererV2() )->symbol()->color();
+  QgsSingleSymbolRendererV2* renderer = dynamic_cast<QgsSingleSymbolRendererV2*>( vl->rendererV2() );
+  if ( renderer )
+    return renderer->symbol()->color();
+  else
+    return QColor();
 }
 
 void TestQgsMapLayerStyleManager::testSwitchingStyles()