diff --git a/aiogram/dispatcher/middlewares/user_context.py b/aiogram/dispatcher/middlewares/user_context.py
index 0c780048..b7a374a0 100644
--- a/aiogram/dispatcher/middlewares/user_context.py
+++ b/aiogram/dispatcher/middlewares/user_context.py
@@ -3,6 +3,7 @@ from typing import Any, Awaitable, Callable, Dict, Optional
 
 from aiogram.dispatcher.middlewares.base import BaseMiddleware
 from aiogram.types import Chat, InaccessibleMessage, TelegramObject, Update, User
+from aiogram.types.chat_boost_source_premium import ChatBoostSourcePremium
 
 EVENT_CONTEXT_KEY = "event_context"
 
@@ -115,6 +116,14 @@ class UserContextMiddleware(BaseMiddleware):
         if event.message_reaction_count:
             return EventContext(chat=event.message_reaction_count.chat)
         if event.chat_boost:
+            # We only check the premium source, because only it has a sender user,
+            # other sources have a user, but it is not the sender, but the recipient
+            if isinstance(event.chat_boost.boost.source, ChatBoostSourcePremium):
+                return EventContext(
+                    chat=event.chat_boost.chat,
+                    user=event.chat_boost.boost.source.user,
+                )
+
             return EventContext(chat=event.chat_boost.chat)
         if event.removed_chat_boost:
             return EventContext(chat=event.removed_chat_boost.chat)