Program: 79925
Project: 79925
Buggy source:
@SuppressWarnings("String_Node_Str") public static void openSettings(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 : slots) {
    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;
      }
    }
);
  }
  if (SlimefunManager.isItemSimiliar(guide,getItem(BookDesign.CHEST),true)) {
    if (p.hasPermission("String_Node_Str")) {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.BOOK));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
 else {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.BOOK));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
  }
 else   if (SlimefunManager.isItemSimiliar(guide,getItem(BookDesign.BOOK),true)) {
    if (p.hasPermission("String_Node_Str")) {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.CHEAT_SHEET));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
 else {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.CHEST));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
  }
 else   if (SlimefunManager.isItemSimiliar(guide,getItem(BookDesign.CHEAT_SHEET),true)) {
    menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
    menu.addMenuClickHandler(19,new MenuClickHandler(){
      @Override public boolean onClick(      Player p,      int arg1,      ItemStack arg2,      ClickAction arg3){
        p.getInventory().setItemInMainHand(getItem(BookDesign.CHEST));
        openSettings(p,p.getInventory().getItemInMainHand());
        return false;
      }
    }
);
  }
  menu.addItem(1,new CustomItem(new MaterialData(Material.BOOK_AND_QUILL),"String_Node_Str","String_Node_Str","String_Node_Str" + SlimefunStartup.instance.getDescription().getVersion(),"String_Node_Str" + contributors.size(),"String_Node_Str","String_Node_Str"));
  menu.addMenuClickHandler(1,new MenuClickHandler(){
    @Override public boolean onClick(    Player p,    int arg1,    ItemStack arg2,    ClickAction arg3){
      openCredits(p,guide);
      return false;
    }
  }
);
  try {
    menu.addItem(4,new CustomItem(new MaterialData(Material.REDSTONE_COMPARATOR),"String_Node_Str","String_Node_Str","String_Node_Str" + IntegerFormat.formatBigNumber(code_bytes),"String_Node_Str" + IntegerFormat.timeDelta(last_update) + "String_Node_Str","String_Node_Str" + forks,"String_Node_Str" + stars,"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
    menu.addMenuClickHandler(4,new MenuClickHandler(){
      @Override public boolean onClick(      Player p,      int arg1,      ItemStack arg2,      ClickAction arg3){
        p.closeInventory();
        p.sendMessage("String_Node_Str");
        p.sendMessage(ChatColor.translateAlternateColorCodes('&',"String_Node_Str"));
        p.sendMessage("String_Node_Str");
        return false;
      }
    }
);
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
  menu.addItem(7,new CustomItem(new MaterialData(Material.REDSTONE),"String_Node_Str","String_Node_Str","String_Node_Str" + issues,"String_Node_Str","String_Node_Str"));
  menu.addMenuClickHandler(7,new MenuClickHandler(){
    @Override public boolean onClick(    Player p,    int arg1,    ItemStack arg2,    ClickAction arg3){
      p.closeInventory();
      p.sendMessage("String_Node_Str");
      p.sendMessage(ChatColor.translateAlternateColorCodes('&',"String_Node_Str"));
      p.sendMessage("String_Node_Str");
      return false;
    }
  }
);
  menu.open(p);
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") public static void openSettings(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 : slots) {
    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;
      }
    }
);
  }
  if (SlimefunManager.isItemSimiliar(guide,getItem(BookDesign.CHEST),true)) {
    if (p.hasPermission("String_Node_Str")) {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.BOOK));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
 else {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.BOOK));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
  }
 else   if (SlimefunManager.isItemSimiliar(guide,getItem(BookDesign.BOOK),true)) {
    if (p.hasPermission("String_Node_Str")) {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.CHEAT_SHEET));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
 else {
      menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
      menu.addMenuClickHandler(19,new MenuClickHandler(){
        @Override public boolean onClick(        Player p,        int arg1,        ItemStack arg2,        ClickAction arg3){
          p.getInventory().setItemInMainHand(getItem(BookDesign.CHEST));
          openSettings(p,p.getInventory().getItemInMainHand());
          return false;
        }
      }
);
    }
  }
 else   if (SlimefunManager.isItemSimiliar(guide,getItem(BookDesign.CHEAT_SHEET),true)) {
    menu.addItem(19,new CustomItem(new MaterialData(Material.CHEST),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
    menu.addMenuClickHandler(19,new MenuClickHandler(){
      @Override public boolean onClick(      Player p,      int arg1,      ItemStack arg2,      ClickAction arg3){
        p.getInventory().setItemInMainHand(getItem(BookDesign.CHEST));
        openSettings(p,p.getInventory().getItemInMainHand());
        return false;
      }
    }
);
  }
  menu.addItem(1,new CustomItem(new MaterialData(Material.BOOK_AND_QUILL),"String_Node_Str","String_Node_Str","String_Node_Str" + SlimefunStartup.instance.getDescription().getVersion(),"String_Node_Str" + contributors.size(),"String_Node_Str","String_Node_Str"));
  menu.addMenuClickHandler(1,new MenuClickHandler(){
    @Override public boolean onClick(    Player p,    int arg1,    ItemStack arg2,    ClickAction arg3){
      openCredits(p,guide);
      return false;
    }
  }
);
  try {
    menu.addItem(4,new CustomItem(new MaterialData(Material.REDSTONE_COMPARATOR),"String_Node_Str","String_Node_Str","String_Node_Str" + IntegerFormat.formatBigNumber(code_bytes),"String_Node_Str" + IntegerFormat.timeDelta(last_update) + "String_Node_Str","String_Node_Str" + forks,"String_Node_Str" + stars,"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
    menu.addMenuClickHandler(4,new MenuClickHandler(){
      @Override public boolean onClick(      Player p,      int arg1,      ItemStack arg2,      ClickAction arg3){
        p.closeInventory();
        p.sendMessage("String_Node_Str");
        p.sendMessage(ChatColor.translateAlternateColorCodes('&',"String_Node_Str"));
        p.sendMessage("String_Node_Str");
        return false;
      }
    }
);
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
  menu.addItem(7,new CustomItem(new MaterialData(Material.REDSTONE),"String_Node_Str","String_Node_Str","String_Node_Str" + issues,"String_Node_Str","String_Node_Str"));
  menu.addMenuClickHandler(7,new MenuClickHandler(){
    @Override public boolean onClick(    Player p,    int arg1,    ItemStack arg2,    ClickAction arg3){
      p.closeInventory();
      p.sendMessage("String_Node_Str");
      p.sendMessage(ChatColor.translateAlternateColorCodes('&',"String_Node_Str"));
      p.sendMessage("String_Node_Str");
      return false;
    }
  }
);
  menu.open(p);
}