From 50aa92ebdecf5422205af98dfd2728f249ee42be Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Wed, 14 Sep 2022 17:11:13 +0200
Subject: [PATCH] Handle CancelledError inside update loop

This error is not really unexpected, since the library uses it to
cancel the task during disconnect.

Closes #3921.
---
 telethon/client/updates.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/telethon/client/updates.py b/telethon/client/updates.py
index 17b93db1..735f45aa 100644
--- a/telethon/client/updates.py
+++ b/telethon/client/updates.py
@@ -351,6 +351,8 @@ class UpdateMethods:
                     continue  # get(_channel)_difference will start returning requests
 
                 updates_to_dispatch.extend(self._preprocess_updates(processed, users, chats))
+        except asyncio.CancelledError:
+            pass
         except Exception:
             self._log[__name__].exception('Fatal error handling updates (this is a bug in Telethon, please report it)')