ERROR Object of class CI_DB_mysqli_result could not be converted to int

public function v_tambah_barang_dipinjam(){

$nama_barang['nb'] = $this->input->post('nama_barang'); $jsa = $this->db->query("SELECT jumlah_barang FROM stok WHERE nama_barang='$nama_barang'");

$data['stok'] = $this->M_admin->lihat_barang()->result(); $this->load->view('v_tambah_barang_dipinjam',$data+$nama_barang+$jsa); }