Program: 34016
Project: 34016
Buggy source:
/** 
 * This covers items in a chest, etc. inventory, then change the name then
 * @param e
 */
@EventHandler(priority=EventPriority.NORMAL,ignoreCancelled=false) public void onInventoryOpen(InventoryOpenEvent e){
  if (e.getPlayer().getWorld().getName().equalsIgnoreCase(Settings.worldName)) {
    Inventory inventory=e.getInventory();
    if (Settings.acidDamage == 0D) {
      return;
    }
    if (inventory.getName() != null && inventory.getName().equalsIgnoreCase(plugin.myLocale(e.getPlayer().getUniqueId()).islandMiniShopTitle)) {
      return;
    }
    if (inventory.contains(Material.WATER_BUCKET)) {
      ItemStack[] inv=inventory.getContents();
      for (      ItemStack item : inv) {
        if (item != null) {
          if (item.getType() == Material.WATER_BUCKET) {
            ItemMeta meta=item.getItemMeta();
            meta.setDisplayName(plugin.myLocale(e.getPlayer().getUniqueId()).acidBucket);
            lore=Arrays.asList(plugin.myLocale(e.getPlayer().getUniqueId()).acidLore.split("String_Node_Str"));
            meta.setLore(lore);
            item.setItemMeta(meta);
          }
        }
      }
    }
 else     if (inventory.contains(Material.POTION)) {
      ItemStack[] inv=inventory.getContents();
      for (      ItemStack item : inv) {
        if (item != null) {
          if (item.getType() == Material.POTION && item.getDurability() == 0) {
            ItemMeta meta=item.getItemMeta();
            meta.setDisplayName(plugin.myLocale(e.getPlayer().getUniqueId()).acidBottle);
            meta.setLore(lore);
            item.setItemMeta(meta);
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * This covers items in a chest, etc. inventory, then change the name then
 * @param e
 */
@EventHandler(priority=EventPriority.NORMAL,ignoreCancelled=false) public void onInventoryOpen(InventoryOpenEvent e){
  if (e.getPlayer().getWorld().getName().equalsIgnoreCase(Settings.worldName)) {
    Inventory inventory=e.getInventory();
    if (Settings.acidDamage == 0D) {
      return;
    }
    if (inventory.getName() != null && inventory.getName().equalsIgnoreCase(plugin.myLocale(e.getPlayer().getUniqueId()).islandMiniShopTitle)) {
      return;
    }
    if (inventory.contains(Material.WATER_BUCKET)) {
      ItemStack[] inv=inventory.getContents();
      for (      ItemStack item : inv) {
        if (item != null) {
          if (item.getType() == Material.WATER_BUCKET) {
            ItemMeta meta=item.getItemMeta();
            meta.setDisplayName(plugin.myLocale(e.getPlayer().getUniqueId()).acidBucket);
            lore=Arrays.asList(plugin.myLocale(e.getPlayer().getUniqueId()).acidLore.split("String_Node_Str"));
            meta.setLore(lore);
            item.setItemMeta(meta);
          }
        }
      }
    }
 else     if (inventory.contains(Material.POTION)) {
      ItemStack[] inv=inventory.getContents();
      for (      ItemStack item : inv) {
        if (item != null) {
          if (item.getType() == Material.POTION && item.getDurability() == 0) {
            ItemMeta meta=item.getItemMeta();
            meta.setDisplayName(plugin.myLocale(e.getPlayer().getUniqueId()).acidBottle);
            lore=Arrays.asList(plugin.myLocale(e.getPlayer().getUniqueId()).acidLore.split("String_Node_Str"));
            meta.setLore(lore);
            item.setItemMeta(meta);
          }
        }
      }
    }
  }
}