diff --git a/app/chat/exceptions.py b/app/chat/exceptions.py
index e4f615f..c71d84a 100644
--- a/app/chat/exceptions.py
+++ b/app/chat/exceptions.py
@@ -36,3 +36,8 @@ class UserAlreadyPinnedChatException(BlackPhoenixException):
 class MessageAlreadyPinnedException(BlackPhoenixException):
 	status_code = status.HTTP_409_CONFLICT
 	detail = "Сообщение уже закрепили"
+
+
+class ChatNotFoundException(BlackPhoenixException):
+	status_code = status.HTTP_409_CONFLICT
+	detail = "Чат не найден"
diff --git a/app/chat/router.py b/app/chat/router.py
index fcff0eb..1e8432f 100644
--- a/app/chat/router.py
+++ b/app/chat/router.py
@@ -133,7 +133,7 @@ async def invite_to_chat(
 ):
 	invitation_data = decode_invitation_token(invitation_token)
 	async with uow:
-		chat = await uow.chat.find_one_or_none(id=invitation_data.chat_id)
+		chat = await uow.chat.find_one(chat_id=invitation_data.chat_id, user_id=user.id)
 		if user.id == chat.chat_for:
 			raise UserCanNotReadThisChatException
 		await uow.chat.add_user_to_chat(chat_id=invitation_data.chat_id, user_id=user.id)
@@ -147,7 +147,7 @@ async def invite_to_chat(
 )
 async def delete_chat(chat_id: int, user: SUser = Depends(check_verificated_user_with_exc), uow=Depends(UnitOfWork)):
 	async with uow:
-		chat = await uow.chat.find_one_or_none(id=chat_id)
+		chat = await uow.chat.find_one(chat_id=chat_id, user_id=user.id)
 		if not user.id == chat.created_by:
 			raise UserDontHavePermissionException
 		await uow.chat.delete_chat(chat_id)
@@ -166,7 +166,7 @@ async def delete_user_from_chat(
 		uow=Depends(UnitOfWork)
 ):
 	async with uow:
-		chat = await uow.chat.find_one_or_none(id=chat_id)
+		chat = await uow.chat.find_one(chat_id=chat_id, user_id=user.id)
 		if not user.id == chat.created_by:
 			raise UserDontHavePermissionException
 		await uow.chat.delete_user_from_chat(chat_id=chat_id, user_id=user_id)
diff --git a/app/dao/chat.py b/app/dao/chat.py
index 040fa30..29a677e 100644
--- a/app/dao/chat.py
+++ b/app/dao/chat.py
@@ -9,8 +9,9 @@ from app.chat.exceptions import (
 	UserAlreadyPinnedChatException,
 	MessageNotFoundException,
 	MessageAlreadyPinnedException,
+	ChatNotFoundException,
 )
-from app.chat.shemas import SMessage, SMessageList, SPinnedMessages, SPinnedChats
+from app.chat.shemas import SMessage, SMessageList, SPinnedMessages, SPinnedChats, SChat
 from app.models.users import Users
 from app.models.message_answer import MessageAnswer
 from app.models.chat import Chat
@@ -27,11 +28,26 @@ class ChatDAO(BaseDAO):
 	def check_query_compile(query):
 		print(query.compile(engine, compile_kwargs={"literal_binds": True}))  # Проверка SQL запроса
 
-	async def find_one_or_none(self, **filter_by):
-		query = select(Chat.__table__.columns).filter_by(**filter_by)
-		result = await self.session.execute(query)
-		result = result.mappings().one_or_none()
-		return result
+	async def find_one(self, chat_id: int, user_id: int) -> SChat:
+		try:
+			query = (
+				select(
+					Chat.id.label("chat_id"),
+					Chat.chat_for,
+					Chat.chat_name,
+					Users.avatar_image
+				)
+				.select_from(Chat)
+				.join(UserChat, Chat.id == UserChat.chat_id)
+				.join(Users, UserChat.user_id == Users.id)
+				.where(UserChat.chat_id == chat_id, UserChat.user_id == user_id)
+			)
+
+			result = await self.session.execute(query)
+			result = result.mappings().one()
+			return SChat.model_validate(result)
+		except NoResultFound:
+			raise ChatNotFoundException
 
 	async def create_chat(self, user_id: int, chat_name: str, created_by: int) -> int:
 		stmt = insert(Chat).values(chat_for=user_id, chat_name=chat_name, created_by=created_by).returning(Chat.id)
diff --git a/app/utils/auth.py b/app/utils/auth.py
index d049d3b..4218274 100644
--- a/app/utils/auth.py
+++ b/app/utils/auth.py
@@ -11,7 +11,7 @@ from app.exceptions import (
 	UserMustConfirmEmailException,
 )
 from app.users.exceptions import IncorrectAuthDataException
-from app.chat.exceptions import UserDontHavePermissionException
+from app.chat.exceptions import UserDontHavePermissionException, ChatNotFoundException
 from app.unit_of_work import UnitOfWork
 from app.users.schemas import SUser, SConfirmationData, SInvitationData
 
@@ -101,17 +101,11 @@ class AuthService:
 		if not await cls.check_verificated_user(uow=uow, user_id=user_id):
 			raise UserMustConfirmEmailException
 
-	@staticmethod
-	async def get_user_allowed_chats_id(uow: UnitOfWork, user_id: int) -> set[int]:
-		async with uow:
-			user_allowed_chats = await uow.user.get_user_allowed_chats(user_id)
-			user_allowed_chats_id = {chat.chat_id for chat in user_allowed_chats.allowed_chats}
-			return user_allowed_chats_id
-
 	@classmethod
-	async def validate_user_access_to_chat(cls, uow: UnitOfWork, user_id: int, chat_id: int) -> bool:
-		user_allowed_chats = await cls.get_user_allowed_chats_id(uow=uow, user_id=user_id)
-		if chat_id not in user_allowed_chats:
+	async def validate_user_access_to_chat(cls, uow: UnitOfWork, user_id: int, chat_id: int) -> None:
+		try:
+			async with uow:
+				await uow.chat.find_one(chat_id=chat_id, user_id=user_id)
+		except ChatNotFoundException:
 			raise UserDontHavePermissionException
-		return True
 
diff --git a/docker/Dockerfile_back b/docker/Dockerfile_back
index 0b45151..2877ff2 100644
--- a/docker/Dockerfile_back
+++ b/docker/Dockerfile_back
@@ -26,5 +26,5 @@ RUN chown -R app:app $APP_HOME
 
 USER app
 
-CMD ["gunicorn", "app.main:app", "--workers", "1", "--worker-class", "uvicorn.workers.UvicornWorker", "--bind=0.0.0.0:8000"]
+CMD ["hypercorn", "app.main:app"]