CodeIgniter insert two rows instead one - php

Question

I have an issue with CodeIgniter. For some reason it insert two rows in database instead one.
Below is code from model:
/**
* Add new fuel
*/
public function addNewFuel($id = NULL, $data) {
if ($id) {
var_dump('TEST');
$data = array(
'price' => '333' ,
'fuel' => 'dizelka' ,
'petrol_id' => '66'
);
echo '<pre>';
print_r($data);
echo '</pre>';
$this->db->insert('prices', $data);
echo $this->db->last_query();
$this->db->insert('prices_archive',$data);
return;
}
}
And here is output:
string(4) "TEST"
Array
(
[price] => 333
[fuel] => dizelka
[petrol_id] => 66
)
EDIT:
This is code from controller which calls model's function:
function addnewfuel() {
if ($this->session->userdata('logged_in')) {
$this->load->helper('form');
$id = $this->uri->segment(3);
$fuel = $this->input->post('fuel');
$price = $this->input->post('price');
$addNewFuel = array('fuel' => $fuel, 'price' => $price);
$data['addNewFuel'] = $this->Adminarea_model->addNewFuel($id,$addNewFuel);
$data['getFuels'] = $this->Adminarea_model->getFuels();
$data['getPetrolNameByID'] = $this->Adminarea_model->getPetrolNameByID();
$data['getPetrolInformation'] = $this->Adminarea_model->getPetrolInformation();
$this->load->view('admin/edit', $data);
} else {
//If no session, redirect to login page
redirect('login', 'refresh');
}
}
For some reasons in a table 'prices' I'm getting two rows with same data, and I really don't have idea why that happens.
Thanks

Answer 1

You are inserting data both from controller as well as from model.
remove this from model, hope it ill solve the problem. Thanks
$data = array(
'price' => '333' ,
'fuel' => 'dizelka' ,
'petrol_id' => '66'
);