From 2af962230f3642f2821dba9a8b0b2805246d7ac9 Mon Sep 17 00:00:00 2001
From: "Dmitry D. Chernov" <blackdoomer@yandex.ru>
Date: Mon, 19 Jun 2017 07:20:36 +1000
Subject: [PATCH] Fix error 400:CONNECTION_APP_VERSION_EMPTY when using
 temporary sessions

---
 telethon/tl/session.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/telethon/tl/session.py b/telethon/tl/session.py
index da0453b9..dc1b13ed 100644
--- a/telethon/tl/session.py
+++ b/telethon/tl/session.py
@@ -110,7 +110,7 @@ class JsonSession:
             # For connection purposes
             self.device_model = platform.node()
             self.system_version = platform.system()
-            self.app_version = '0'
+            self.app_version = '1.0'  # note: '0' will provoke error
             self.lang_code = 'en'
 
         elif isinstance(session_user_id, JsonSession):