Use undefined

Author: RaisinTen

src/crypto/crypto_dh.cc

@@ -28,6 +28,7 @@ using v8::ReadOnly;
 using v8::SideEffectType;
 using v8::Signature;
 using v8::String;
+using v8::Undefined;
 using v8::Value;
 
 namespace crypto {
@@ -575,7 +576,7 @@ Local<Value> StatelessDiffieHellman(
                                            their_key,
                                            &buf,
                                            &out_size))
-    return Local<Value>();
+    return Undefined(env->isolate());
 
   return Buffer::New(env,
                      buf,
@@ -621,7 +622,7 @@ void DiffieHellman::Stateless(const FunctionCallbackInfo<Value>& args) {
   ManagedEVPPKey their_key = their_key_object->Data()->GetAsymmetricKey();
 
   Local<Value> out = StatelessDiffieHellman(env, our_key, their_key);
-  if (out.IsEmpty() || Buffer::Length(out) == 0)
+  if (out->IsUndefined() || Buffer::Length(out) == 0)
     return ThrowCryptoError(env, ERR_get_error(), "diffieHellman failed");
 
   args.GetReturnValue().Set(out);