@EventHandler
 public void onInventoryClose(InventoryCloseEvent e) {
   if (!Config.separateInv) return;
   if (!(e.getPlayer() instanceof Player)) return;
   Player p = (Player) e.getPlayer();
   if (e.getInventory().getType() != InventoryType.PLAYER) return;
   InventoryHolder thisIh = e.getInventory().getHolder();
   InventoryHolder playIh = p.getInventory().getHolder();
   if (thisIh == null || playIh == null) return;
   if (!thisIh.equals(playIh)) return; // only save their inv when they close /their/ inv
   String group = getWorldGroup(p.getWorld());
   if (group == null) return; // only manage worlds that are in the config
   saveInventory(p, p.getInventory());
 }