diff --git a/libs/Zend/Session.php b/libs/Zend/Session.php
index 21451e0ffaa..f0979206135 100644
--- a/libs/Zend/Session.php
+++ b/libs/Zend/Session.php
@@ -478,13 +478,6 @@ public static function start($options = false)
                . " output started in {$filename}/{$linenum}");
         }
 
-        // See http://www.php.net/manual/en/ref.session.php for explanation
-        if (!self::$_unitTestEnabled && defined('SID')) {
-            /** @see Zend_Session_Exception */
-            // require_once 'Zend/Session/Exception.php';
-            throw new Zend_Session_Exception('session has already been started by session.auto-start or session_start()');
-        }
-
         /**
          * Hack to throw exceptions on start instead of php errors
          * @see http://framework.zend.com/issues/browse/ZF-1325