From cbf6306599115ad7a130eee07a8bf7106caef683 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Fri, 29 Dec 2017 22:07:16 +0100
Subject: [PATCH] Fix early cast to input from 932ed9e causing error on Peer

---
 telethon/tl/session.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/telethon/tl/session.py b/telethon/tl/session.py
index 8c2850bf..3fa13d23 100644
--- a/telethon/tl/session.py
+++ b/telethon/tl/session.py
@@ -336,10 +336,12 @@ class Session:
            Raises ValueError if it cannot be found.
         """
         if isinstance(key, TLObject):
-            key = utils.get_input_peer(key)
-            if type(key).SUBCLASS_OF_ID == 0xc91c90b6:  # crc32(b'InputPeer')
-                return key
-            key = utils.get_peer_id(key)
+            try:
+                # Try to early return if this key can be casted as input peer
+                return utils.get_input_peer(key)
+            except TypeError:
+                # Otherwise, get the ID of the peer
+                key = utils.get_peer_id(key)
 
         c = self._conn.cursor()
         if isinstance(key, str):