Почему возникает ошибка AttributeError: 'NoneType' object has no attribute 'cursor'?

При выполнении функции name почему-то вылазит ошибка:

AttributeError: 'NoneType' object has no attribute 'cursor'

Из-за чего это?

import nl_international as db_nl_international; from 
nl_international import Database
import asyncio
async def name_nl_international(name_search):
  database = await Database.ConnectDatabase()
  result = await asyncio.gather(Database.name(database, 
name_search))
  return result

# -*- coding: utf-8 -*-
import aiosqlite
from sqlite3 import Error

class Database():
  async def ConnectDatabase(**kwargs):
    try:
      db = await aiosqlite.connect('nl_international.db', check_same_thread=False)
      c = await db.cursor()
    except Error:
      print(f'Database: {Error}')

  async def name(db, name_search):
    c = await db.cursor()
    result = await c.execute(f"SELECT * FROM clients WHERE name == '{name_search}'").fetchall()
    await db.commit()
    return result