fix machine crashes?
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		| @@ -830,13 +830,7 @@ class BotBase(GroupMixin): | ||||
|  | ||||
|         if not isinstance(ret, str): | ||||
|             try: | ||||
|                 if self.case_insensitive_prefix: | ||||
|                     temp = [] | ||||
|                     for pre in ret: | ||||
|                         temp += list(map(''.join, itertools.product(*((c.upper(), c.lower()) for c in pre)))) | ||||
|                     ret = temp | ||||
|                 else: | ||||
|                     ret = list(ret) | ||||
|                 ret = list(ret) | ||||
|             except TypeError: | ||||
|                 # It's possible that a generator raised this exception.  Don't | ||||
|                 # replace it with our own error if that's the case. | ||||
| @@ -850,7 +844,15 @@ class BotBase(GroupMixin): | ||||
|                 raise ValueError("Iterable command_prefix must contain at least one prefix") | ||||
|  | ||||
|         if self.case_insensitive_prefix: | ||||
|             return list(map(''.join, itertools.product(*((c.upper(), c.lower()) for c in ret)))) | ||||
|             if isinstance(ret, list): | ||||
|                 temp = [] | ||||
|                 for pre in ret: | ||||
|                     if pre in (self.user.mention + ' ', '<@!%s> ' % self.user.id): | ||||
|                         continue | ||||
|                     temp += list(map(''.join, itertools.product(*((c.upper(), c.lower()) for c in pre)))) | ||||
|                 ret = temp | ||||
|             else: | ||||
|                 ret = list(map(''.join, itertools.product(*((c.upper(), c.lower()) for c in ret)))) | ||||
|         return ret | ||||
|  | ||||
|     async def get_context(self, message, *, cls=Context): | ||||
|   | ||||
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