Fix

main.py

@@ -164,7 +164,6 @@ async def start_census(message: types.Message):
 @dp.callback_query(lambda c: c.data == "census_join")
 async def register_user(callback_query: types.CallbackQuery):
     user = callback_query.from_user
-    chat_id = callback_query.message.chat.id
     username = user.username or user.full_name
 
     try:
@@ -201,7 +200,7 @@ async def send_file(message: Message):
 
 
 @dp.message()
-async def default_message(message: types.Message):
+async def default_message():
     pass
 
 async def main():