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 550, in seen
    time_delta_min = round(min(delta_t/60))
TypeError: unsupported operand type(s) for /: 'list' and 'int'