Program: 79921
Project: 79921
Buggy source:
@SuppressWarnings("String_Node_Str") public static void openCredits(Player p,final ItemStack guide){
  final ChestMenu menu=new ChestMenu("String_Node_Str");
  menu.addMenuOpeningHandler(new MenuOpeningHandler(){
    @Override public void onOpen(    Player p){
      p.playSound(p.getLocation(),Sound.BLOCK_NOTE_HARP,0.7F,0.7F);
    }
  }
);
  for (int i=0; i < 9; i++) {
    if (i != 4) {
      menu.addItem(i,new CustomItem(new MaterialData(Material.STAINED_GLASS_PANE,(byte)7),"String_Node_Str"));
      menu.addMenuClickHandler(i,new MenuClickHandler(){
        @Override public boolean onClick(        Player arg0,        int arg1,        ItemStack arg2,        ClickAction arg3){
          return false;
        }
      }
);
    }
 else {
      menu.addItem(4,new CustomItem(new MaterialData(Material.EMERALD),"String_Node_Str"));
      menu.addMenuClickHandler(4,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          openSettings(p,guide);
          return false;
        }
      }
);
    }
  }
  int index=9;
  double total=0;
  for (  Contributor contributor : contributors) {
    total+=contributor.getCommits();
  }
  for (  final Contributor contributor : contributors) {
    ItemStack skull=new SkullItem("String_Node_Str" + contributor.getName(),contributor.getName());
    ItemMeta meta=skull.getItemMeta();
    if (contributor.getCommits() > 0) {
      double percentage=DoubleHandler.fixDouble((contributor.getCommits() * 100.0) / total,2);
      meta.setLore(Arrays.asList("String_Node_Str",ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getJob()),ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getCommits() + "String_Node_Str"+ percentage+ "String_Node_Str"),"String_Node_Str",ChatColor.translateAlternateColorCodes('&',"String_Node_Str")));
    }
 else {
      meta.setLore(Arrays.asList("String_Node_Str",ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getJob())));
    }
    skull.setItemMeta(meta);
    menu.addItem(index,skull);
    menu.addMenuClickHandler(index,new MenuClickHandler(){
      @Override public boolean onClick(      Player p,      int arg1,      ItemStack arg2,      ClickAction arg3){
        if (contributor.getCommits() > 0) {
          p.closeInventory();
          p.sendMessage("String_Node_Str");
          p.sendMessage(ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getProfile()));
          p.sendMessage("String_Node_Str");
        }
        return false;
      }
    }
);
    index++;
  }
  for (int i=0; i < 9; i++) {
    menu.addItem(36 + i,new CustomItem(new MaterialData(Material.STAINED_GLASS_PANE,(byte)7),"String_Node_Str"));
    menu.addMenuClickHandler(36 + i,new MenuClickHandler(){
      @Override public boolean onClick(      Player arg0,      int arg1,      ItemStack arg2,      ClickAction arg3){
        return false;
      }
    }
);
  }
  menu.open(p);
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") public static void openCredits(Player p,final ItemStack guide){
  final ChestMenu menu=new ChestMenu("String_Node_Str");
  menu.setEmptySlotsClickable(false);
  menu.addMenuOpeningHandler(new MenuOpeningHandler(){
    @Override public void onOpen(    Player p){
      p.playSound(p.getLocation(),Sound.BLOCK_NOTE_HARP,0.7F,0.7F);
    }
  }
);
  for (int i=0; i < 9; i++) {
    if (i != 4) {
      menu.addItem(i,new CustomItem(new MaterialData(Material.STAINED_GLASS_PANE,(byte)7),"String_Node_Str"));
      menu.addMenuClickHandler(i,new MenuClickHandler(){
        @Override public boolean onClick(        Player arg0,        int arg1,        ItemStack arg2,        ClickAction arg3){
          return false;
        }
      }
);
    }
 else {
      menu.addItem(4,new CustomItem(new MaterialData(Material.EMERALD),"String_Node_Str"));
      menu.addMenuClickHandler(4,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          openSettings(p,guide);
          return false;
        }
      }
);
    }
  }
  int index=9;
  double total=0;
  for (  Contributor contributor : contributors) {
    total+=contributor.getCommits();
  }
  for (  final Contributor contributor : contributors) {
    ItemStack skull=new SkullItem("String_Node_Str" + contributor.getName(),contributor.getName());
    ItemMeta meta=skull.getItemMeta();
    if (contributor.getCommits() > 0) {
      double percentage=DoubleHandler.fixDouble((contributor.getCommits() * 100.0) / total,2);
      meta.setLore(Arrays.asList("String_Node_Str",ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getJob()),ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getCommits() + "String_Node_Str"+ percentage+ "String_Node_Str"),"String_Node_Str",ChatColor.translateAlternateColorCodes('&',"String_Node_Str")));
    }
 else {
      meta.setLore(Arrays.asList("String_Node_Str",ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getJob())));
    }
    skull.setItemMeta(meta);
    menu.addItem(index,skull);
    menu.addMenuClickHandler(index,new MenuClickHandler(){
      @Override public boolean onClick(      Player p,      int arg1,      ItemStack arg2,      ClickAction arg3){
        if (contributor.getCommits() > 0) {
          p.closeInventory();
          p.sendMessage("String_Node_Str");
          p.sendMessage(ChatColor.translateAlternateColorCodes('&',"String_Node_Str" + contributor.getProfile()));
          p.sendMessage("String_Node_Str");
        }
        return false;
      }
    }
);
    index++;
  }
  for (int i=0; i < 9; i++) {
    menu.addItem(36 + i,new CustomItem(new MaterialData(Material.STAINED_GLASS_PANE,(byte)7),"String_Node_Str"));
    menu.addMenuClickHandler(36 + i,new MenuClickHandler(){
      @Override public boolean onClick(      Player arg0,      int arg1,      ItemStack arg2,      ClickAction arg3){
        return false;
      }
    }
);
  }
  menu.open(p);
}