changed all request to the new isset function

admin/index.php

@@ -8,7 +8,7 @@
     require_once("/var/www/furatalog/data/script/furatalog.sessions.php");
     $fs = new furatalogSessions();
 
-    if (($fs->getSessionData("login") == null) && ($fs->getSessionData("login") != "true-as-hell")) {
+    if (!$fs->issetSessionData("login") && ($fs->getSessionData("login") != "true-as-hell")) {
         header("Location: login.php");
         die();
     }