From d073d7691178a875ec081e2d91eb349b91dc8d30 Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Sat, 9 Jul 2016 22:35:37 +0200
Subject: [PATCH] Guard against broken cache

---
 .../install/files/lib/system/breadcrumb/Breadcrumbs.class.php   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php b/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php
index 6169e515a1..fecbd71a28 100644
--- a/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php
+++ b/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php
@@ -95,7 +95,7 @@ class Breadcrumbs extends SingletonFactory implements \Countable, \Iterator {
 			
 			if ($location['pageID']) {
 				$page = PageCache::getInstance()->getPage($location['pageID']);
-				while ($page->parentPageID) {
+				while ($page !== null && $page->parentPageID) {
 					$page = PageCache::getInstance()->getPage($page->parentPageID);
 					
 					array_unshift($locations, [
-- 
2.20.1