Why insert/create does not work in Laravel?

SQL Dump is:

CREATE TABLE `visitors` (
  `idVisitor` int(11) NOT NULL,
  `firstname` varchar(100) NOT NULL,
  `lastname` varchar(100) NOT NULL,
  `middlename` varchar(100) NOT NULL,
  `document_number` varchar(100) NOT NULL,
  `pincode` varchar(20) NOT NULL,
  `ckecked` int(11) NOT NULL DEFAULT '0',
  `date_cheked` date DEFAULT NULL,
  `user_cheked` int(11) DEFAULT NULL,
  `company` varchar(100) DEFAULT NULL,
  `code` varchar(100) NOT NULL,
  `idEvent` int(11) 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;

ALTER TABLE `visitors`
  MODIFY `idVisitor` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1;
COMMIT;

Full model is:

class Visitor extends Model
{
    public $timestamps = false;

    public $table = 'visitors';

    protected $guarded = [];

    protected $primaryKey = 'idVisitor';

    protected static function boot()
    {
        parent::boot();

        static::addGlobalScope(new StatusScope);
    }

    public function checker()
    {
        return $this->hasOne('App\User', 'id', 'user_checked');
    }

    public function event()
    {
        return $this->belongsTo('App\Event', 'idEvent', 'idEvent');

    }
}

Insert is:

  DB::table('visitors')->insert(
            [
                    'lastname' => '1',
                    'firstname' => '2',
                    'middlename' => '2',
                    'birthday' => '2018-05-01',
                    'company' => 'dadadad',
                    'document_number' => 2424,
                    'pincode' => '444',
                    'code' => '4444',
                    'idEvent' => 17,
                ]
        );

Also I tried:

Visitors::insert([
                    'firstname' => 'john@example.com',
                    'lastname' => 0, 'middlename' => '', 'document_number' => 'e', 'pincode' => '44',
                    'company' => '444', 'code' => '4', 'idEvent' => 17,
                ]);

So, I dont get any errors and SQL exceptions, connection with db is stable.

It just does not add data to db.

The way:

Visitors::create();

Also has no effect.

I tried to list all fields in model:

protected $fillable = ['firstname', 'lastname', 'middlename', 'document_number', 'pincode', 'ckecked', 'date_cheked', 'user_cheked', 'company', 'code', 'status', 'date', 'birthday', 'idEvent'];

No effect!!! But query DELETE works

via Chebli Mohamed