diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index f02d78f6134..f5a5db89fa0 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1500,6 +1500,8 @@ public:
   unsigned getNodePriority(const SUnit *SU) const;
 
   unsigned getNodeOrdering(const SUnit *SU) const {
+    if (!SU->getNode()) return 0;
+
     return scheduleDAG->DAG->GetOrdering(SU->getNode());
   }