Can't send reply with markup by Telegram Bot API

Question

Trying to build up a simple bot. Here's my code:

    require 'vendor/autoload.php';
    use Telegram\Bot\Api;
    $telegram = new Api('<MY TOKEN>');
    $result = $telegram -> getWebhookUpdates();

    $text = $result["message"]["text"]; 
    $chat_id = $result["message"]["chat"]["id"]; 
    $name = $result["message"]["from"]["username"]; 
    $keyboard = [["news"],["more news"],["loolz"]]; 


    if ($text == "/start") {
            $reply = "Hello there!";
            $reply_markup = $telegram->replyKeyboardMarkup([ 'keyboard' => $keyboard, 'resize_keyboard' => true, 'one_time_keyboard' => false ]);
            $telegram->sendMessage([ 'chat_id' => $chat_id, 'text' => $reply, 'reply_markup' => $reply_markup ]);
    }

    if ($text == "/btn1") {
        $reply = "AWESOME! YOU TAPPED 2nd BUTTON :)";

        $telegram->sendMessage([ 'chat_id' => $chat_id, 'text' => $reply ]);
    }

Condition if ($text == "/btn1") works, but it stops when i add $reply_markup to "btn1" action. Accordingly, the first condition also does not work due to $reply_markup

This SDK used in my project: click

How should i fix this? ty <3