fix #15634

Author: jef-n

src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.cpp

@@ -1007,11 +1007,11 @@ void QgsCategorizedSymbolRendererV2Widget::matchToSymbolsFromXml()
 
 void QgsCategorizedSymbolRendererV2Widget::cleanUpSymbolSelector( QgsPanelWidget *container )
 {
-  if ( container )
-  {
-    QgsSymbolV2SelectorWidget* dlg = qobject_cast<QgsSymbolV2SelectorWidget*>( container );
-    delete dlg->symbol();
-  }
+  QgsSymbolV2SelectorWidget *dlg = qobject_cast<QgsSymbolV2SelectorWidget*>( container );
+  if ( !dlg )
+    return;
+
+  delete dlg->symbol();
 }
 
 void QgsCategorizedSymbolRendererV2Widget::updateSymbolsFromWidget()

src/gui/symbology-ng/qgsgraduatedsymbolrendererv2widget.cpp

@@ -689,11 +689,11 @@ void QgsGraduatedSymbolRendererV2Widget::refreshRanges( bool reset )
 
 void QgsGraduatedSymbolRendererV2Widget::cleanUpSymbolSelector( QgsPanelWidget *container )
 {
-  if ( container )
-  {
-    QgsSymbolV2SelectorWidget* dlg = qobject_cast<QgsSymbolV2SelectorWidget*>( container );
-    delete dlg->symbol();
-  }
+  QgsSymbolV2SelectorWidget *dlg = qobject_cast<QgsSymbolV2SelectorWidget*>( container );
+  if ( !dlg )
+    return;
+
+  delete dlg->symbol();
 }
 
 void QgsGraduatedSymbolRendererV2Widget::updateSymbolsFromWidget()

src/gui/symbology-ng/qgsrulebasedrendererv2widget.cpp

@@ -481,7 +481,10 @@ void QgsRuleBasedRendererV2Widget::refineRuleRangesAccepted( QgsPanelWidget *pan
 
 void QgsRuleBasedRendererV2Widget::ruleWidgetPanelAccepted( QgsPanelWidget *panel )
 {
-  QgsRendererRulePropsWidget* widget = qobject_cast<QgsRendererRulePropsWidget*>( panel );
+  QgsRendererRulePropsWidget *widget = qobject_cast<QgsRendererRulePropsWidget*>( panel );
+  if ( !widget )
+    return;
+
   widget->apply();
 
   // model should know about the change and emit dataChanged signal for the view