def check_invalid_subreddits(self, subreddits):
        invalid = []
        for subreddit in subreddits:
            try:
                for submission in self.reddit.subreddit(subreddit).new(limit=1):
                    print('subreddit is valid')
            except Redirect:  # was praw.errors.InvalidSubreddit without 'len()' around call in the try block
                Logger.log(traceback.format_exc(), Color.RED)
                invalid.append(subreddit)
        return invalid