From c430850154b4346bc02ec7dd6c931c4649088b5e Mon Sep 17 00:00:00 2001
From: umherirrender <umherirrender_de.wp@web.de>
Date: Tue, 12 May 2015 20:43:59 +0200
Subject: [PATCH] Check result of preg_match_all in Parser.php

preg_match_all can return false on failure, which than results in
undefined index access.
Check the result and just keep it as nothing found by processing an
empty array

Change-Id: I1f11894240dc6869506d68d3513715abdc3abb5d
---
 includes/parser/Parser.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/includes/parser/Parser.php b/includes/parser/Parser.php
index 27de03929d..4ea68fcbcf 100644
--- a/includes/parser/Parser.php
+++ b/includes/parser/Parser.php
@@ -4446,7 +4446,9 @@ class Parser {
 		$tocraw = array();
 		$refers = array();
 
-		foreach ( $matches[3] as $headline ) {
+		$headlines = $numMatches !== false ? $matches[3] : array();
+
+		foreach ( $headlines as $headline ) {
 			$isTemplate = false;
 			$titleText = false;
 			$sectionIndex = false;
-- 
2.20.1