From 5bba7264c69b654ac5bcb87769781138be61cb92 Mon Sep 17 00:00:00 2001
From: Daniel Hensby <dhensby@silverstripe.com>
Date: Tue, 10 Jan 2017 16:20:22 +0000
Subject: [PATCH] FIX Dont attempt to iterate over null in
 SiteTree::allowedChildren

---
 code/model/SiteTree.php | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/code/model/SiteTree.php b/code/model/SiteTree.php
index 792c0e17f2..cc0f21f5e7 100755
--- a/code/model/SiteTree.php
+++ b/code/model/SiteTree.php
@@ -2695,8 +2695,7 @@ public function allowedChildren() {
 				// Otherwise, the class and all its subclasses are allowed.
 				if(substr($candidate,0,1) == '*') {
 					$allowedChildren[] = substr($candidate,1);
-				} else {
-					$subclasses = ClassInfo::subclassesFor($candidate);
+				} elseif ($subclasses = ClassInfo::subclassesFor($candidate)) {
 					foreach($subclasses as $subclass) {
 						if ($subclass == 'SiteTree_root' || singleton($subclass) instanceof HiddenClass) {
 							continue;