From 757e2037e74fecca521c664fc8486596b306de39 Mon Sep 17 00:00:00 2001
From: Harshitha KP <harshi46@in.ibm.com>
Date: Tue, 25 Feb 2020 02:46:16 -0500
Subject: src: Handle bad callback in asyc_wrap

Align with the MaybeLocal<> API contract

PR-URL: https://github.com/nodejs/node/pull/31946
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 src/async_wrap-inl.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/async_wrap-inl.h b/src/async_wrap-inl.h
index e3e48666e4f..03745081f3b 100644
--- a/src/async_wrap-inl.h
+++ b/src/async_wrap-inl.h
@@ -74,9 +74,8 @@ inline v8::MaybeLocal<v8::Value> AsyncWrap::MakeCallback(
   if (!object()->Get(env()->context(), symbol).ToLocal(&cb_v))
     return v8::MaybeLocal<v8::Value>();
   if (!cb_v->IsFunction()) {
-    // TODO(addaleax): We should throw an error here to fulfill the
-    // `MaybeLocal<>` API contract.
-    return v8::MaybeLocal<v8::Value>();
+    v8::Isolate* isolate = env()->isolate();
+    return Undefined(isolate);
   }
   return MakeCallback(cb_v.As<v8::Function>(), argc, argv);
 }
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