From 5fd615516872d56c55dc15210274055d487013d2 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Sun, 8 Apr 2018 11:22:59 +0200
Subject: [PATCH] Fix remove_event_handler's loop

---
 telethon/telegram_client.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index 736b9297..d84ca57d 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -2276,8 +2276,10 @@ class TelegramClient(TelegramBareClient):
         if event and not isinstance(event, type):
             event = type(event)
 
-        for i, ec in enumerate(self._event_builders):
-            ev, cb = ec
+        i = len(self._event_builders)
+        while i:
+            i -= 1
+            ev, cb = self._event_builders[i]
             if cb == callback and (not event or isinstance(ev, event)):
                 del self._event_builders[i]
                 found += 1