Why data is not inserted in Laravel?

I try to insert array to table:

Inserting data is:

$item = [
  "lastname" => "Husey"
  "firstname" => "Fik"
  "middlename" => "Akif"
  "birthday" => "1981-04-09"
  "company" => "XXX"
  "document_number" => 16428285.0
  "pincode" => "QT0FE12"
  "code" => 19283746564923.0
  "idEvent" => "17"
]

Insert into model:

Visitor::create($item);

Model Visitor is:

class Visitor extends Model
{
    public $timestamps = false;

    public $table = 'visitors';

    public $fillable = [
    'firstname', 
    'lastname', 
    'middlename', 
    'document_number', 
    'pincode', 
    'ckecked', 
    'date_cheked',
    'user_checked',
    'company',
    'code',
    'idEvent',
    'date',
    'birthday'
    ];
}

Dump SQL is:

CREATE TABLE `visitors` (
  `idVisitor` int(11) NOT NULL,
  `firstname` varchar(45) NOT NULL,
  `lastname` varchar(45) NOT NULL,
  `middlename` varchar(45) DEFAULT NULL,
  `document_number` varchar(45) NOT NULL,
  `pincode` varchar(10) NOT NULL,
  `ckecked` int(11) DEFAULT '0',
  `date_cheked` date DEFAULT NULL,
  `user_checked` int(10) UNSIGNED DEFAULT NULL,
  `company` varchar(100) DEFAULT NULL,
  `code` varchar(100) DEFAULT NULL,
  `idEvent` int(10) NOT NULL,
  `status` int(11) NOT NULL DEFAULT '1',
  `date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `birthday` date DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

I dont get any exception or errors.

If to make the following:

$s = Visitor::create($item);
dd($s);

It returns full model data, but DB table is empty!

via Chebli Mohamed