Is it a bug of CakePHP?

["Pham Huu Le Quoc Phuc" <phucphlq@xxxxxxxxxx>]

I catch an error, could you tell me if you have some ideas?

class Dsptraining extends AppModel
{
     function GetDsptrainings()
     {
          return $this->findBySql("select max(start_date) start_date from
tbl_dsptrainings");
     }
}

class DsptrainingsController extends AppController
{
        function index()
        {
          $data = $this->Dsptraining->GetDsptrainings();
          echo $data[0]['start_date'];
      }
}

Error message: Undefined index: start_date in
c:\Inetpub\wwwroot\Cake\app\controllers\dsptrainings_controller.php on line
33

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