#vulnerable code 
                                static GHDiscussion read(GHTeam team, long discussionNumber) throws IOException {
        return team.root.createRequest()
                .setRawUrlPath(team.getUrl().toString() + "/discussions/" + discussionNumber)
                .fetch(GHDiscussion.class)
                .wrapUp(team);
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                static GHDiscussion read(GHTeam team, long discussionNumber) throws IOException {
        return team.root.createRequest()
                .setRawUrlPath(getRawUrlPath(team, discussionNumber))
                .fetch(GHDiscussion.class)
                .wrapUp(team);
    }