#vulnerable code 
                                public String getSubreddit() throws IOException, ParseException {
        if (subreddit != null) {
            return subreddit;
        }
        if (url == null)
            throw new IOException("URL needs to be present");

        return info(url).get("subreddit").toString();
    } 
                            #location 8 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public String getSubreddit() {
        return subreddit;
    }