diff --git a/app/mongo_worker.py b/app/mongo_worker.py
index e0f0fe6..69ac46f 100644
--- a/app/mongo_worker.py
+++ b/app/mongo_worker.py
@@ -23,7 +23,7 @@ class MongoWorker:
         print(self.client.list_database_names())
         print(self.db.list_collection_names())
 
-    def check_user(self, user_id: int) -> True | False:
+    def check_user(self, user_id: int) -> bool:
         if self.users_data.find_one({"user_id": user_id}):
             return True
         else:
diff --git a/app/schemas.py b/app/schemas.py
index 91cec5f..aa68d8b 100644
--- a/app/schemas.py
+++ b/app/schemas.py
@@ -10,8 +10,8 @@ class User(BaseModel):
     photo_path: str
 
     activity: int = 0
-    liked_post_ids: list[int] = None
-    disliked_post_ids: list[int] = None
-    comments_ids: list[int] = None
+    liked_post_ids: list[int] = list()
+    disliked_post_ids: list[int] = list()
+    comments_ids: list[int] = list()
 
     registration_date: str