output: #fixed code
                                  private void sendMessageToGuild(Guild guild, Player player, String message) {
          for (User user : guild.getOnlineMembers()) {
              Player p = user.getPlayer();
              
              if(!p.equals(player) || !user.isSpy()) {
                  p.sendMessage(message);
              }
          }
      }
input: #vulnerable code 
                                  private void sendMessageToGuild(Guild guild, Player player, String message) {
          for (User user : guild.getMembers()) {
              Player loopedPlayer = this.plugin.getServer().getPlayer(user.getName());
              if (loopedPlayer != null) {
                  if (user.getPlayer().equals(player)) {
                      if (!user.isSpy()) {
                          loopedPlayer.sendMessage(message);
                      }
                  } else {
                      loopedPlayer.sendMessage(message);
                  }
              }
          }
      } 
                              #location 5 
                              #vulnerability type NULL_DEREFERENCE