App\Http\Controllers\User\ProfileController::retreiveUser PHP Method

    protected function retreiveUser($id)
    {
        $user = $this->handler->users()->find($id);
        if ($user === null) {
            $user = $this->handler->users()->where(['displayName' => $id]);
        }
        if ($user === null) {
            throw new UserNotFoundException();
        }
        return $user;
    }