TypeError: 'in <string>' requires string as left operand, not NoneType

[bim-ba]

System info

1. What version of pyTelegramBotAPI are you using?
   4.0.0

2. What OS are you using?
   GNU/Linux 5.14.2-arch1-2

3. What version of python are you using?
   3.9.7

---

Code

import telebot

bot = telebot.TeleBot(token)

search = []

@bot.message_handler(commands='start')
def start(message):
    bot.send_message(message.chat.id, 'Just use /find command!')

@bot.message_handler(commands='find')
def find(message):
    if message.chat.id not in search:
        bot.send_message(message.chat.id, 'Finding...')
        search.append(message.chat.id)
        print(search)
    else:
        bot.send_message(message.chat.id, 'Shut up!')

@bot.message_handler(commands='stop')
def stop(message):
    if message.chat.id in search:
        bot.send_message(message.chat.id, 'Stopping...')
        search.remove(message.chat.id)
        print(search)
    else:
        bot.send_message(message.chat.id, 'You are not in search!')

bot.polling()

Screenshot

[Badiboy]

"commands" should be LIST

(commands=['start'])