From 4baef4de09ca451a7b2fb56bf922f875995edf50 Mon Sep 17 00:00:00 2001
From: kolay <kolayv@pm.me>
Date: Sat, 3 Oct 2020 17:53:35 +0300
Subject: [PATCH] replaced return None with error

Co-authored-by: Lonami <totufals@hotmail.com>
---
 telethon/client/chats.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/telethon/client/chats.py b/telethon/client/chats.py
index 55d6494f..06d77294 100644
--- a/telethon/client/chats.py
+++ b/telethon/client/chats.py
@@ -1184,7 +1184,7 @@ class ChatMethods:
             for participant in chat.participants.participants:
                 if participant.user_id == user.id:
                     return custom.ParticipantPermissions(participant.participant, True)
-            return None
+            raise errors.UserNotParticipantError(None)
 
         raise ValueError('You must pass either a channel or a chat')