Insert query fail in CodeIgniter

Question

I don't know why but the insert query fail, this is my code:

public function insert_resource($resource) 
{
    try
    {
        $data = array(
            'descrizione' => $resource['descrizione'],
            'sigla' => $resource['sigla'],
            'colore' => $resource['colore'],
            'planning' => $resource['planning'],
            'data' => 0
        );

        if(!$this->db->insert('risorse', $data))
        {
            throw new Exception("Can't insert the resource");
        }
    }
    catch(Exception $e)
    {
        echo $e->getMessage();
    }
}

Now the $resource contains all data like:

• descrizione
• sigla
• colore
• planning
• data
  except for the id, that's auto_increment so I doesn't include the id in the $data variable. In the network tab I get:

Can't insert the resource

id: null

status: "SUCCESS"

why happean this?

LAST_QUERY

INSERT INTO `risorse` (`descrizione`, `sigla`, `colore`, `planning`, `data`, `id`) VALUES ('sdfdf', 'fdfd', '12FFEF', 'NoviSoft', 0, 'null')

Answer 1

$this->db->insert('risorse', $data);
if ( $this->db->affected_rows() == 0 ){ 
     echo $this->db->_error_message();
     throw new Exception("Can't insert the resource");
}