diff --git a/llvm/lib/IR/Instruction.cpp b/llvm/lib/IR/Instruction.cpp
index 27b2c5ee4d399..7449692f05d7b 100644
--- a/llvm/lib/IR/Instruction.cpp
+++ b/llvm/lib/IR/Instruction.cpp
@@ -146,6 +146,8 @@ void Instruction::insertBefore(BasicBlock &BB,
   bool InsertAtHead = InsertPos.getHeadBit();
   if (!InsertAtHead) {
     DPMarker *SrcMarker = BB.getMarker(InsertPos);
+    if (!SrcMarker)
+      SrcMarker = BB.createMarker(InsertPos);
     DbgMarker->absorbDebugValues(*SrcMarker, false);
   }