From fce2056abfcffb1302c51a7fb12c42e23d4b3cb9 Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Tue, 20 Nov 2012 09:58:15 +0100
Subject: [PATCH] fixed: make sure we do not dereference null ptrs

---
 dune/elasticity/asmhandler_impl.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dune/elasticity/asmhandler_impl.hpp b/dune/elasticity/asmhandler_impl.hpp
index 8a4dbbe..73b5e16 100644
--- a/dune/elasticity/asmhandler_impl.hpp
+++ b/dune/elasticity/asmhandler_impl.hpp
@@ -70,7 +70,7 @@ void ASMHandler<GridType>::addDOF(int row, int erow,
       }
     }
   }
-  if (S)
+  if (S && b)
     (*b)[row] += scale*(*S)[erow];
 }