#fixed code
                              public static void main(@Nullable String[] args) throws IOException, InterruptedException {
    Timer.open();
    Socks5Server socks5Server = new Socks5Server();
    socks5Server.start(args);
  }
#vulnerable code 
                              public static void main(@Nullable String[] args) throws IOException, InterruptedException {
    Timer.open();
    Socks5Server socks5Server = new Socks5Server();
    socks5Server.start(args);
    BasicSocksProxyServer server = (BasicSocksProxyServer) socks5Server.server;
    NetworkMonitor monitor = server.getNetworkMonitor();
    while (true) {
      logger.info(monitor.toString());
      Thread.sleep(5000);
    }

  } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE