Fixed KeyError on deleting waiter.

MrBotDeveloper · web-flow · commit bb13e6380ba0 · 2022-04-14T12:10:53.000+05:30
diff --git a/pyrogram/handlers/conversation_handler.py b/pyrogram/handlers/conversation_handler.py
@@ -61,5 +61,8 @@ async def callback(_, __):
         pass
 
     def delete_waiter(self, chat_id, future):
-        if future == self.waiters[chat_id]['future']:
-            del self.waiters[chat_id]
+        try:
+            if future == self.waiters[chat_id]['future']:
+                del self.waiters[chat_id]
+        except KeyError:
+            pass
