diff --git a/widget/xpwidgets/PuppetWidget.cpp b/widget/xpwidgets/PuppetWidget.cpp
index 6bd14cbe2375..0e9f595853e6 100644
--- a/widget/xpwidgets/PuppetWidget.cpp
+++ b/widget/xpwidgets/PuppetWidget.cpp
@@ -540,7 +540,9 @@ PuppetWidget::Paint()
     }
   }
 
-  mAttachedWidgetListener->DidPaintWindow();
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->DidPaintWindow();
+  }
 
   return NS_OK;
 }