diff --git a/tgbot/middlewares/subscription.py b/tgbot/middlewares/subscription.py
index 1fdbfa7..73ba456 100644
--- a/tgbot/middlewares/subscription.py
+++ b/tgbot/middlewares/subscription.py
@@ -24,14 +24,14 @@ async def setup_channels(cls, dp: Dispatcher, channels_ids: list[int]) -> None:
     async def on_process_message(self, message: Message, data: dict) -> None:
         user = data.get('user')
         if not user:
-            raise KeyError(f"User not found in data")
+            raise KeyError("User not found in data")
 
         await self.check_subscriptions(message, user=user)
 
     async def on_process_callback_query(self, call: CallbackQuery, data: dict) -> None:
         user = data.get('user')
         if not user:
-            raise KeyError(f"User not found in data")
+            raise KeyError("User not found in data")
 
         await self.check_subscriptions(call.message, user=user,
                                        call=call, callback_data=data.get("callback_data"))
diff --git a/tgbot/states/__init__.py b/tgbot/states/__init__.py
index 6192fb0..eeb5b95 100644
--- a/tgbot/states/__init__.py
+++ b/tgbot/states/__init__.py
@@ -1,2 +1,7 @@
 from .send_all import SendAllState
 from .ping import PingState
+
+__all__ = [
+    "SendAllState",
+    "PingState"
+]