diff -ru src/Symfony/Component/DomCrawler/Crawler.php src/Symfony/Component/DomCrawler/Crawler.php
--- src/Symfony/Component/DomCrawler/Crawler.php	2014-04-16 21:22:28.837442703 +0000
+++ src/Symfony/Component/DomCrawler/Crawler.php	2014-04-16 21:22:30.941442703 +0000
@@ -107,7 +107,7 @@
 
         // DOM only for HTML/XML content
         if (!preg_match('/(x|ht)ml/i', $type, $xmlMatches)) {
-            return null;
+            return;
         }
 
         $charset = null;
@@ -831,7 +831,7 @@
             }
         }
 
-        return null;
+        return;
     }
 
     /**