diff --git a/aiogram/dispatcher/handler/base.py b/aiogram/dispatcher/handler/base.py
index 2759bbb1..017f4c65 100644
--- a/aiogram/dispatcher/handler/base.py
+++ b/aiogram/dispatcher/handler/base.py
@@ -9,6 +9,7 @@ class BaseHandlerMixin:
     """
     Typed mixin. Do nothing.
     """
+
     event: TelegramObject
     data: Dict[str, Any]
 
@@ -17,6 +18,7 @@ class _HandlerBotMixin(BaseHandlerMixin):
     """
     Mixin adds bot attribute
     """
+
     @property
     def bot(self) -> Bot:
         if "bot" in self.data:
diff --git a/aiogram/dispatcher/handler/message.py b/aiogram/dispatcher/handler/message.py
index a0a7bcbd..92b4b486 100644
--- a/aiogram/dispatcher/handler/message.py
+++ b/aiogram/dispatcher/handler/message.py
@@ -1,7 +1,7 @@
 from abc import ABC
 from typing import Optional
 
-from aiogram.api.types import Message, User, Chat
+from aiogram.api.types import Chat, Message, User
 from aiogram.dispatcher.filters import CommandObject
 from aiogram.dispatcher.handler.base import BaseHandler, BaseHandlerMixin
 
@@ -10,7 +10,7 @@ class MessageHandler(BaseHandler, ABC):
     event: Message
 
     @property
-    def from_user(self) -> User:
+    def from_user(self) -> Optional[User]:
         return self.event.from_user
 
     @property