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\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\help.py", line 836, in command_callback
    return await self.send_bot_help(mapping)
  File "C:\Users\wmiller\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\help.py", line 1026, in send_bot_help
    filtered = await self.filter_commands(bot.commands, sort=True, key=get_category)
  File "C:\Users\wmiller\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\help.py", line 577, in filter_commands
    valid = await predicate(cmd)
  File "C:\Users\wmiller\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\help.py", line 571, in predicate
    return await cmd.can_run(self.context)
  File "C:\Users\wmiller\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ext\commands\core.py", line 1076, in can_run
    return await discord.utils.async_all(predicate(ctx) for predicate in predicates)
  File "C:\Users\wmiller\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\utils.py", line 340, in async_all
    elem = await elem
  File "c:\Users\wmiller\Desktop\Swimbot\server_manager.py", line 13, in guild_owner
    return ctx.author.id == ctx.guild.owner.id
AttributeError: 'NoneType' object has no attribute 'id'