Fix warning when selectTelegramUpdate() returns bool

src/Telegram.php

@@ -458,7 +458,8 @@ class Telegram
         $this->getCommandsList();
 
         //Make sure we don't try to process update that was already processed
-        if (count(DB::selectTelegramUpdate(1, $this->update->getUpdateId())) === 1) {
+        $last_id = DB::selectTelegramUpdate(1, $this->update->getUpdateId());
+        if ($last_id && count($last_id) === 1) {
             TelegramLog::debug('Duplicate update received, processing aborted!');
             return Request::emptyResponse();
         }