cakephp - Undefined index: token Error -

i using github repository code here: https://github.com/hunzinker/cakephp-auth-forgot-password

i have used following function in userscontroller.php. error undefined index: token on line has comment before it. should change?

/**  * allow user reset password if $token valid.  * @return  */ function reset_password_token($reset_password_token = null) {     if (empty($this->data)) {         $this->data = $this->user->findbyresetpasswordtoken($reset_password_token);          if (!empty($this->data['user']['reset_password_token']) &&             !empty($this->data['user']['token_created_at']) &&             $this->__validtoken($this->data['user']['token_created_at'])         ) {             $this->data['user']['id'] = null;             $_session['token'] = $reset_password_token;         } else {             $this->session->setflash(                 'the password reset request has either expired or invalid.'             );             $this->redirect('/users/login');         }     } else {         //error on next line here undefined index: token         if ($this->data['user']['reset_password_token'] != $_session['token']) {             $this->session->setflash(                 'the password reset request has either expired or invalid.'             );             $this->redirect('/users/login');         }          $user = $this->user->findbyresetpasswordtoken(             $this->data['user']['reset_password_token']         );         $this->user->id = $user['user']['id'];          if ($this->user->save($this->data, array('validate' => 'only'))) {             $this->data['user']['reset_password_token'] =                 $this->data['user']['token_created_at'] = null;              if ($this->user->save($this->data) &&                 $this->__sendpasswordchangedemail($user['user']['id'])             ) {                 unset($_session['token']);                 $this->session->setflash(                     'your password changed successfully. please login continue.'                 );                 $this->redirect('/users/login');             }         }     } } 

you need sure $_session contains index, should update in order sure exists:

by this:

if (!isset($_session['token']) || $this->data['user']['reset_password_token'] != $_session['token']) {     $this->session->setflash(         'the password reset request has either expired or invalid.'     );     $this->redirect('/users/login'); }