ผิดตรงไหนครับ ทำไมมันถึงไม่เข้าเงือนไข ครับ Codelgniter

public function Checkcustomer($code)
{

  $rs = $this->db->select('id_customer')->where('code', $code)->get($this->table);
  if($rs->num_rows() == 0)
  {
      return FALSE;
  }


return TRUE;
}

  public function cutVoucher()
  {
    $sc = TRUE;
    if($this->input->post('voucher'))
    {
      $this->load->model('transection_model');
      //$this->load->model('voucher_model');
      $amount = $this->input->post('amount');
      $code = $this->input->post('voucher');
      $item = $this->input->post('item');
      $voucher = $this->voucher_model->getVoucherByCode($code);

      $checkcus = $this->voucher_model->Checkcustomer($code);
      if($voucher === FALSE)
      {
        $sc = FALSE;
        $message = 'Voucher ไม่ถูกต้อง';
      }

      else if($checkcus === FALSE)
      {
        $sc = FALSE;
        $message = 'ไม่พบ Customer';
      }