MySQL, Querybuilder, Controller problems... ERR 2014

Try this and see if the error goes away.

PHP Code:

class Suppliers_model extends CI_Model {

    public function __construct()
    {
        $this->load->database();
    }

    public function get_suppliers($id = FALSE)
    {
        $data = array();

        if ($id === FALSE)
        {
            //$query = $this->db->get('suppliers');
            $query = $this->db->query('call read_supplier_list()');
            $data  = $query->result_array();

            $query->free_result();
            return $data;
        }

        $query = $this->db->query('call read_supplier(' . $id . ')');
        //$query = $this->db->get_where('suppliers', array('id' => $id));

        $data $query->row_array();
                
        $query->free_result();
        return $data;
    }

    public function get_supplier_certificates($supplier_id)
    {
        $data = array();
            
        //$query = $this->db->query('call read_supplier_certificates(' . $supplier_id . ')');
        $query = $this->db->get_where('supplier_certificates', array('supplier_id', $supplier_id));
        $data  = $query->result_array();
                
        $query->free_result();
        return $data;
    } 


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