From a337ebcf0d10f0976c1af49191dd151350cb8b32 Mon Sep 17 00:00:00 2001
From: Aurelien Bruno <aurelbruno06@gmail.com>
Date: Mon, 2 Dec 2019 22:29:19 +0100
Subject: [PATCH] update getObjectProperty(msg,expr)

update getObjectProperty(msg,expr) to support invalid expression to return undefined instead of crashing

Quick Check

m = {a:{b:{c:{d:{e:"hello"}}}}};

console.log(getMessageProperty(m,"a.b.c.d"))
console.log(getMessageProperty(m,"a.j.c.d"))

{ e: 'hello' }
undefined

instead of with current code

        result = ( typeof obj[key] !== "undefined" ? obj[key] : undefined);
                              ^

TypeError: Cannot read property 'c' of undefined
---
 packages/node_modules/@node-red/util/lib/util.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/node_modules/@node-red/util/lib/util.js b/packages/node_modules/@node-red/util/lib/util.js
index ef43739e6..1930cd6be 100644
--- a/packages/node_modules/@node-red/util/lib/util.js
+++ b/packages/node_modules/@node-red/util/lib/util.js
@@ -325,7 +325,7 @@ function getObjectProperty(msg,expr) {
     var msgPropParts = normalisePropertyExpression(expr);
     var m;
     msgPropParts.reduce(function(obj, key) {
-        result = (typeof obj[key] !== "undefined" ? obj[key] : undefined);
+        result = ((obj && typeof obj[key] !== "undefined") ? obj[key] : undefined);
         return result;
     }, msg);
     return result;