From f79a56b431a3e6afa66ac8799ee7e25838059328 Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Sun, 22 Apr 2012 08:56:25 +0200
Subject: [PATCH] fixed compatibility with PHP 5.2 and simplify code a bit

---
 lib/Twig/Error.php |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/Twig/Error.php b/lib/Twig/Error.php
index a2ffd35..e32c5c9 100644
--- a/lib/Twig/Error.php
+++ b/lib/Twig/Error.php
@@ -172,7 +172,7 @@ class Twig_Error extends Exception
         $file = $r->getFileName();
 
         $exceptions = array($e = $this);
-        while ($e = $e->getPrevious()) {
+        while (method_exists($e, 'getPrevious') && $e = $e->getPrevious()) {
             $exceptions[] = $e;
         }
 
-- 
1.7.2.5