#vulnerable code 
                                public synchronized Scoreboard getScoreboard() {
        if (this.scoreboard == null) {
            this.scoreboard = Bukkit.getScoreboardManager().getNewScoreboard();
        }

        return this.scoreboard;
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public synchronized Scoreboard getScoreboard() {
        return this.scoreboard;
    }