From fa78bb3d78418fad126dddc02d497c0e35529f66 Mon Sep 17 00:00:00 2001
From: Nick O'Leary <nick.oleary@gmail.com>
Date: Mon, 26 Feb 2024 16:17:09 +0000
Subject: [PATCH] Handle undefined env vars Fixes #4579

---
 packages/node_modules/@node-red/runtime/lib/flows/Flow.js    | 2 +-
 packages/node_modules/@node-red/runtime/lib/flows/Group.js   | 2 +-
 packages/node_modules/@node-red/runtime/lib/flows/Subflow.js | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/node_modules/@node-red/runtime/lib/flows/Flow.js b/packages/node_modules/@node-red/runtime/lib/flows/Flow.js
index b541a9d95..dd3d335a2 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/Flow.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/Flow.js
@@ -485,7 +485,7 @@ class Flow {
         }
         if (!key.startsWith("$parent.")) {
             if (this._env.hasOwnProperty(key)) {
-                return (Object.hasOwn(this._env[key], 'value') && this._env[key].__clone__) ? clone(this._env[key].value) : this._env[key]
+                return (this._env[key] && Object.hasOwn(this._env[key], 'value') && this._env[key].__clone__) ? clone(this._env[key].value) : this._env[key]
             }
         } else {
                 key = key.substring(8);
diff --git a/packages/node_modules/@node-red/runtime/lib/flows/Group.js b/packages/node_modules/@node-red/runtime/lib/flows/Group.js
index 521b6ceda..90d93cf45 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/Group.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/Group.js
@@ -41,7 +41,7 @@ class Group {
         }
         if (!key.startsWith("$parent.")) {
             if (this._env.hasOwnProperty(key)) {
-                return (Object.hasOwn(this._env[key], 'value') && this._env[key].__clone__) ? clone(this._env[key].value) : this._env[key]
+                return (this._env[key] && Object.hasOwn(this._env[key], 'value') && this._env[key].__clone__) ? clone(this._env[key].value) : this._env[key]
             }
         } else {
             key = key.substring(8);
diff --git a/packages/node_modules/@node-red/runtime/lib/flows/Subflow.js b/packages/node_modules/@node-red/runtime/lib/flows/Subflow.js
index 62948d203..c3a47e1f7 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/Subflow.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/Subflow.js
@@ -376,7 +376,7 @@ class Subflow extends Flow {
         }
         if (!key.startsWith("$parent.")) {
             if (this._env.hasOwnProperty(key)) {
-                return (Object.hasOwn(this._env[key], 'value') && this._env[key].__clone__) ? clone(this._env[key].value) : this._env[key]
+                return (this._env[key] && Object.hasOwn(this._env[key], 'value') && this._env[key].__clone__) ? clone(this._env[key].value) : this._env[key]
             }
         } else {
             key = key.substring(8);