public void onGuiClosed() {

    super.onGuiClosed();

    if (this.mc.thePlayer != null) {
      for (ItemStack itemStack : this.mc.thePlayer.inventory.mainInventory) {
        if (itemStack != null) {
          if (NBTHelper.hasTag(itemStack, Strings.NBT_ITEM_TRANS_GUI_OPEN)) {
            NBTHelper.removeTag(itemStack, Strings.NBT_ITEM_TRANS_GUI_OPEN);
          }
        }
      }
    }
  }