From a61a41b0c53e1bd958b9ae6fa6a19ec2060eb9a7 Mon Sep 17 00:00:00 2001
From: Luis Fernando Molina <Luis-Fernando-Molina@users.noreply.github.com>
Date: Fri, 9 Oct 2020 10:15:23 +0200
Subject: [PATCH] Update NodeChildren.js

---
 Utilities/NodeChildren.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Utilities/NodeChildren.js b/Utilities/NodeChildren.js
index ad36f93eb..f841180f1 100644
--- a/Utilities/NodeChildren.js
+++ b/Utilities/NodeChildren.js
@@ -17,6 +17,7 @@ function isMissingChildren(startingNode, checkNode, checkReferenceParent) {
             switch (property.type) {
                 case 'node': {
                     let child = startingNode[property.name]
+                    if (child === undefined) { continue }
                     if (checkReferenceParent !== true) {
                         if (child.id === checkNode.id) {
                             return false