diff --git a/pyrogram/session/session.py b/pyrogram/session/session.py
index 34e892e0..fb3b5594 100644
--- a/pyrogram/session/session.py
+++ b/pyrogram/session/session.py
@@ -147,7 +147,7 @@ class Session:
                 log.info("System: {} ({})".format(self.client.system_version, self.client.lang_code.upper()))
 
             except AuthKeyDuplicated as e:
-                self.stop()
+                await self.stop()
                 raise e
             except (OSError, TimeoutError, Error):
                 await self.stop()