Merge branch 'master' of https://github.com/stefangabos/Zebra_Session

Author: stefangabos

Zebra_Session.php

@@ -266,7 +266,7 @@ public function __construct(&$link, $security_code, $session_lifetime = '', $loc
             );
 
             // if a session is already started, destroy it first
-            if (session_id() == '') session_destroy();
+            if (session_id() !== '') session_destroy();
 
             // start session
             session_start();