diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -534,6 +534,9 @@
   if (!MD)
     return nullptr;
 
+  if (!MD->getNumOperands())
+    return nullptr;
+
   const MDOperand &Op = MD->getOperand(0);
   if (!Op.get())
     return nullptr;