Getcomponent unity 4b11

Hi,

Try this on unity 4b11 I have a gameObject "teleport" with this script:

 GameObject obj = GameObject.Find("Fraise");    
         
 ControllerSystem controllerSystem = obj.GetComponent<ControllerSystem>();
 
 if ( controllerSystem.GetNumberOfKey() == 1 && obj.CompareTag("Player"))
 

when my gameObject with tag "Player" hit collider of teleport, message return : NullReferenceException: Object reference not set to an instance of an object

`GameObject obj = GameObject.Find("Fraise");` is finded but not ` ControllerSystem controllerSystem = obj.GetComponent();`

This work fine on 3.5.6f4...

What is wrong ? thanks !