From 1d2420d549e87d237655abfdc8589e305b17fda1 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Tue, 11 Apr 2017 10:25:09 +0200
Subject: [PATCH] Add more informative error message when invoking disconnected

---
 telethon/telegram_client.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index a3d8da6b..8e0b2c52 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -167,6 +167,9 @@ class TelegramClient:
         if not issubclass(type(request), MTProtoRequest):
             raise ValueError('You can only invoke MtProtoRequests')
 
+        if not self.sender:
+            raise ValueError('You must be connected to invoke requests!')
+
         try:
             self.sender.send(request)
             self.sender.receive(request, timeout)