def error(bot, update, error):
    try:
        logger.warn('Update "%s" caused error "%s"' % (update, error))
        raise error
    except Unauthorized:
        db = mysql.connector.connect(user='root', password='', host='localhost', database='ict_telegram')
        cursor = db.cursor(buffered=True)
        delete_user = ("DELETE FROM users WHERE chatid = '%s'" % (update.message.chat_id))
        cursor.execute(delete_user)
        db.commit()
        cursor.close()
        db.close()
    #except BadRequest:
        # handle malformed requests - read more below!
    #except TimedOut:
        # handle slow connection problems
    #except NetworkError:
        # handle other connection problems
    #except ChatMigrated as e:
        # the chat_id of a group has changed, use e.new_chat_id instead
    #except TelegramError:
        # handle all other telegram related errors