diff --git a/llvm/include/llvm/IR/DebugInfoMetadata.h b/llvm/include/llvm/IR/DebugInfoMetadata.h
--- a/llvm/include/llvm/IR/DebugInfoMetadata.h
+++ b/llvm/include/llvm/IR/DebugInfoMetadata.h
@@ -618,7 +618,7 @@
     return StringRefChecksum;
   }
   Optional<StringRef> getSource() const {
-    return Source ? Optional<StringRef>((*Source)->getString()) : None;
+    return (Source && *Source) ? Optional<StringRef>((*Source)->getString()) : None;
   }
 
   MDString *getRawFilename() const { return getOperandAs<MDString>(0); }