diff --git a/pyrogram/session/session.py b/pyrogram/session/session.py
index ef7b565c..b7645b11 100644
--- a/pyrogram/session/session.py
+++ b/pyrogram/session/session.py
@@ -31,7 +31,7 @@ from pyrogram import __copyright__, __license__, __version__
 from pyrogram.api import functions, types, core
 from pyrogram.api.all import layer
 from pyrogram.api.core import Message, Object, MsgContainer, Long, FutureSalt, Int
-from pyrogram.api.errors import Error, InternalServerError
+from pyrogram.api.errors import Error, InternalServerError, AuthKeyDuplicated
 from pyrogram.connection import Connection
 from pyrogram.crypto import AES, KDF
 from .internals import MsgId, MsgFactory, DataCenter
@@ -157,6 +157,9 @@ class Session:
                 self.ping_thread.start()
 
                 log.info("Connection inited: Layer {}".format(layer))
+            except AuthKeyDuplicated as e:
+                self.stop()
+                raise e
             except (OSError, TimeoutError, Error):
                 self.stop()
             except Exception as e: