$NetBSD: patch-cl,v 1.1 2011/04/14 18:11:45 drochner Exp $

--- WebCore/svg/SVGElementInstance.cpp.orig	2010-09-10 13:20:33.000000000 +0000
+++ WebCore/svg/SVGElementInstance.cpp
@@ -103,7 +103,8 @@ void SVGElementInstance::invalidateAllIn
     const HashSet<SVGElementInstance*>::const_iterator end = set.end();
     for (HashSet<SVGElementInstance*>::const_iterator it = set.begin(); it != end; ++it) {
         ASSERT((*it)->correspondingElement() == element);
-        (*it)->correspondingUseElement()->invalidateShadowTree();
+        if (SVGUseElement* element = (*it)->correspondingUseElement())
+            element->invalidateShadowTree();
     }
 }