From ac6dbb8a5ce8a30fb20d2893d90898171b990d71 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Thu, 28 Jun 2018 16:04:12 +0200
Subject: [PATCH] Fix is_connected accessing unexisting property

---
 telethon/client/telegrambaseclient.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/telethon/client/telegrambaseclient.py b/telethon/client/telegrambaseclient.py
index bcc794df..bd05bd12 100644
--- a/telethon/client/telegrambaseclient.py
+++ b/telethon/client/telegrambaseclient.py
@@ -287,7 +287,8 @@ class TelegramBaseClient(abc.ABC):
         """
         Returns ``True`` if the user has connected.
         """
-        return self._sender.is_connected()
+        sender = getattr(self, '_sender', None)
+        return sender and sender.is_connected()
 
     async def disconnect(self):
         """