diff --git a/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h b/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h
--- a/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h
@@ -751,9 +751,9 @@
     Error Result = Error::success();
     if (auto Err =
             SerializationTraits<ChannelT, Error, Error>::deserialize(C, Result))
-      return Err;
+      return joinErrors(std::move(Result), std::move(Err));
     if (auto Err = C.endReceiveMessage())
-      return Err;
+      return joinErrors(std::move(Result), std::move(Err));
     return Handler(std::move(Result));
   }