diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 7ba74425279..c2972b051f7 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1312,8 +1312,9 @@ void SelectionDAGLegalize::LegalizeOp(SDNode *Node) {
           }
           break;
         case TargetLowering::Custom:
-          ReplaceNode(SDValue(Node, 0),
-                      TLI.LowerOperation(SDValue(Node, 0), DAG));
+          Tmp1 = TLI.LowerOperation(SDValue(Node, 0), DAG);
+          if (Tmp1.getNode())
+            ReplaceNode(SDValue(Node, 0), Tmp1);
           break;
         case TargetLowering::Expand:
           assert(!StVT.isVector() &&