--- a/widget/xpwidgets/PuppetWidget.cpp
+++ b/widget/xpwidgets/PuppetWidget.cpp
@@ -535,17 +535,19 @@ PuppetWidget::Paint()
       ctx->Clip();
       AutoLayerManagerSetup setupLayerManager(this, ctx,
                                               BUFFER_NONE);
       mAttachedWidgetListener->PaintWindow(this, region, nsIWidgetListener::WILL_SEND_DID_PAINT);
       mTabChild->NotifyPainted();
     }
   }
 
-  mAttachedWidgetListener->DidPaintWindow();
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->DidPaintWindow();
+  }
 
   return NS_OK;
 }
 
 void
 PuppetWidget::SetChild(PuppetWidget* aChild)
 {
   NS_ABORT_IF_FALSE(this != aChild, "can't parent a widget to itself");