buggy?

    @EventHandler
    public void onPlayerDeathEvent(PlayerDeathEvent event){

        if(event.getEntity() != null && event.getEntity().getLastDamageCause() != null && event.getEntity().getLastDamageCause().getCause() != null && event.getEntity().getLastDamageCause().getCause().equals(EntityDamageEvent.DamageCause.ENTITY_ATTACK)){
            if(r.nextInt(10)==0){
                ItemStack it = new ItemStack(Material.SKULL_ITEM);
                it.setDurability((short)3);
                SkullMeta im = (SkullMeta) it.getItemMeta();

                im.setOwner(event.getEntity().getName());
                im.setDisplayName(Colorizer.Color("&a"+event.getEntity().getName()));
                it.setItemMeta(im);
                event.getEntity().getWorld().dropItemNaturally(event.getEntity().getLocation(),it);
            }
        }
    }

    @EventHandler
    public void onPlaceSkull(BlockPlaceEvent event){
        if(event.isCancelled()){
            return;
        }
        if(getWorldGuard()!=null){
        if(!getWorldGuard().canBuild(event.getPlayer(),event.getBlockPlaced().getLocation())){
            event.setCancelled(true);
            return;
        }}
        if(event.getBlock().getType() == Material.SKULL)
        {
 event.getBlockPlaced().getState().update(true);
        }
    }