Swimbot Error

Traceback (most recent call last):
  File "C:\Users\wmiller\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "c:\Users\wmiller\Desktop\Swimbot\whois.py", line 215, in whois
    info = await COC.swimbot(tag).get_info
  File "c:\Users\wmiller\Desktop\Swimbot\COC.py", line 144, in get_info
    last_time = old_stats['last_update']
NameError: name 'old_stats' is not defined