login permission fix

src/Auth/Business/LuticateBusiness.php

                 $user_id = $data[LuticateUsersBusiness::KEY_USER_ID];
                 $salt = $data[LuticateUsersBusiness::KEY_SALT];
                 $user = LuticateUsersBusiness::getById($user_id);
-                if ($user->getSalt() == $salt) {
-                    self::$_currentUser = $user;
+                if ($user->getSalt() != $salt) {
+                    $user = null;
                 }
             }
         }
-        if (is_null(self::$_currentUser)) {
-            self::$_currentUser = LuticateUsersBusiness::getById(0);
+        if (is_null($user)) {
+            $user = LuticateUsersBusiness::getById(0);
         }
 
         if (!LuticatePermissionsBusiness::getUserPermission($user->getId(), LuticatePermissions::USER_LOGIN))