Почему дублируется отправка сообщений в Telegram Bot (Laravel/BotMan)?

Question

[Dmitriy]

botman.php

<?php
use App\Http\Controllers\BotManController;
use App\Http\Controllers\MainConversation;

$botman = resolve('botman');

$botman->hears('/start', function ( $bot ) {
    $bot->startConversation(new MainConversation());
});

MainConversation.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\User as UserDB;
use BotMan\BotMan\Messages\Outgoing\Actions\Button;
use BotMan\BotMan\Messages\Incoming\Answer as BotManAnswer;
use BotMan\BotMan\Messages\Outgoing\Question as BotManQuestion;
use BotMan\BotMan\Messages\Conversations\Conversation;
use BotMan\BotMan\Messages\Attachments\Image;
use BotMan\BotMan\Messages\Outgoing\OutgoingMessage;


class MainConversation extends Conversation
{
    public $user;

    public function run()
    {
        $this->getUserData();
        $this->exit();
    }

    private function getUserData()
    {
        $this->user = $this->bot->getUser();
        $lastname = $this->user->getLastName() ? $this->user->getLastName() : "Отсутсвует";

        $message = "Имя: {$this->user->getFirstName()}\n".
            "Фамилия: {$lastname}\n".
            "UserName: {$this->user->getUsername()}\n".
            "Id: {$this->user->getId()}";

        return $this->say($message);
    }

    private function exit()
    {

        if (!UserDB::where('username', '=', $this->user->getUsername())->exists()) {
            $db = new UserDB();
            $db->firstname = $this->user->getFirstName();
            $db->lastname = $this->user->getLastName();
            $db->username = $this->user->getUsername();
            $db->user_id = $this->user->getId();
            $db->save();

            $attachment = new Image("https://i.gifer.com/y4.gif");

            $message = OutgoingMessage::create("Спасибо за то что нашли меня!")
                ->withAttachment($attachment);

            $this->bot->reply($message);
        }
        return true;
    }
}