Как связать if и определенный массив в телеграмм боте?

Алан Гибизов, in не работает:

@bot.message_handler(commands='Начать')
def handle_start(message):
	if message.from_user.username in users:
		bot.send_message(message.from_user.id, 'Вот', reply_markup=user_markup, parse_mode='HTML')
	else:
		bot.send_message(message.from_user.id, 'В доступе отказано', reply_markup=user_markup, parse_mode='HTML')

ошибка:

Traceback (most recent call last):
  File "start.py", line 25, in <module>
    bot.polling(none_stop=True, interval=0)
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 485, in polling
    self.__threaded_polling(none_stop, interval, timeout, long_polling_timeout)
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 544, in __threaded_polling
    raise e
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 506, in __threaded_polling
    polling_thread.raise_exceptions()
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/util.py", line 87, in raise_exceptions
    raise self.exception_info
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/util.py", line 69, in run
    task(*args, **kwargs)
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 323, in __retrieve_updates
    self.process_new_updates(updates)
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 384, in process_new_updates
    self.process_new_messages(new_messages)
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 410, in process_new_messages
    self._notify_command_handlers(self.message_handlers, new_messages)
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 2183, in _notify_command_handlers
    if self._test_message_handler(message_handler, message):
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 2149, in _test_message_handler
    if not self._test_filter(message_filter, filter_value, message):
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 2170, in _test_filter
    return test_cases.get(message_filter, lambda msg: False)(message)
  File "/home/mem/.local/lib/python3.8/site-packages/telebot/__init__.py", line 2166, in <lambda>
    'commands': lambda msg: msg.content_type == 'text' and util.extract_command(msg.text) in filter_value,
TypeError: 'in <string>' requires string as left operand, not NoneType

Постараюсь в свободное время ознакомится с данной книгой

Как связать if и определенный массив в телеграмм боте?

Сергей Горностаев, да, я понимаю, что нельзя сравнивать разные типы данных, но когда я ставил скобку и указывал str, ничего не менялось