Python list index out of range error

import requests
from bs4 import BeautifulSoup
import os
import time

import telegram

bot = telegram.Bot(token='123535:AASAAASDFDFDSFSD')
chat_id = bot.getUpdates()[-1].message.chat.id


BASE_DIR = os.path.dirname(os.path.abspath(__file__))

while True:
    req = requests.get('WebURL')
    req.encoding = 'euc-kr'


    soup = BeautifulSoup(req.content.decode('euc-kr','replace'))
    posts = soup.select('Select')
    latest = posts[0].text



    with open(os.path.join(BASE_DIR, 'a.txt'), 'r+') as f_read:
        before = f_read.readline()
        if before != latest:
            bot.sendMessage(chat_id=chat_id, text='TEXT')


    with open(os.path.join(BASE_DIR, 'a.txt'), 'w+') as f_write:
        f_write.write(latest)
        f_write.close()

    time.sleep(5) 

soup = BeautifulSoup(req.content.decode('euc-kr','replace'))
Traceback (most recent call last):
File "/root/a.py", line 23, in <module>
latest = posts[0].text
IndexError: list index out of range