From 7b25ff572c553a5f7bb86be40f22bbc9e5c4e4c9 Mon Sep 17 00:00:00 2001
From: Tim Starling <tstarling@users.mediawiki.org>
Date: Thu, 24 Aug 2006 17:35:42 +0000
Subject: [PATCH] ignore invalid titles in getParentCategoryTree()

---
 includes/Title.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/includes/Title.php b/includes/Title.php
index 6f740dcac4..7eae801723 100644
--- a/includes/Title.php
+++ b/includes/Title.php
@@ -2148,7 +2148,9 @@ class Title {
 					$stack[$parent] = array();
 				} else {
 					$nt = Title::newFromText($parent);
-					$stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
+					if ( $nt ) {
+						$stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
+					}
 				}
 			}
 			return $stack;
-- 
2.20.1