From 441e78a4730de75886f19820ad19d55b644d65c3 Mon Sep 17 00:00:00 2001
From: asimaranov <a.simaranov@gmail.com>
Date: Thu, 16 Dec 2021 20:01:28 +0300
Subject: [PATCH] Fixed unused import

---
 aiogram/dispatcher/fsm/storage/mongo.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/aiogram/dispatcher/fsm/storage/mongo.py b/aiogram/dispatcher/fsm/storage/mongo.py
index 25d5a0da..dd2bc60a 100644
--- a/aiogram/dispatcher/fsm/storage/mongo.py
+++ b/aiogram/dispatcher/fsm/storage/mongo.py
@@ -1,8 +1,8 @@
+import asyncio
 from contextlib import asynccontextmanager
 from typing import Any, AsyncGenerator, Dict, Optional
 
 try:
-    import motor
     from motor.motor_asyncio import AsyncIOMotorClient
 except ModuleNotFoundError as e:
     import warnings
@@ -42,6 +42,7 @@ class MongoStorage(BaseStorage):
         self._db = mongo.get_database(db_name)
         self._with_bot_id = with_bot_id
         self._with_destiny = with_destiny
+        self._lock = asyncio.Lock()
 
     @classmethod
     def from_url(
@@ -95,7 +96,8 @@ class MongoStorage(BaseStorage):
         bot: Bot,
         key: StorageKey,
     ) -> AsyncGenerator[None, None]:
-        yield None
+        async with self._lock:
+            yield None
 
     async def set_state(
         self,