Problem with checking a behavior is loaded or not

I used this peace of code in AppController.php's beforeFilter() method to find a model is actsAs Translate or not:

if (isset($this))
   if (isset($this->modelClass))       
       if (isset($this->{$this->modelClass}))
            if ($this->{$this->modelClass}->Behaviors->loaded('Translate'))
                $this->{$this->modelClass}->locale=$ActiveLanguageCatalog['locale'] ;

but this error will appear when there is no model!

Fatal Error

Error: Cannot access empty property
File: ..\lib\Cake\Controller\Controller.php
Line: 437

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