diff --git a/telethon/network/mtprotosender.py b/telethon/network/mtprotosender.py
index c45e79dd..300d9707 100644
--- a/telethon/network/mtprotosender.py
+++ b/telethon/network/mtprotosender.py
@@ -422,6 +422,8 @@ class MTProtoSender:
 
     def _start_reconnect(self, error):
         """Starts a reconnection in the background."""
+        if not self._auto_reconnect and error is not None:
+            raise error
         if self._user_connected and not self._reconnecting:
             # We set reconnecting to True here and not inside the new task
             # because it may happen that send/recv loop calls this again