NPE on Claim Events

    @SuppressWarnings("deprecation")
    @EventHandler
    public void onPlaceClaimBlock(BlockPlaceEvent e){
        Player player = e.getPlayer();
        Block block = e.getBlock();

        BlockVector p1 = null,p2 = null;

        if(block.getType().equals(Material.SAND)){
            BlockVector loc = new BlockVector(block.getX(), block.getY(), block.getZ());
            player.sendMessage("Location: " + loc);
        }

        if(block.getTypeId() == 19){
            int radius = 1;
            //p1: 295,254,339
            //p2: 293,0,341
            p2 = new BlockVector(block.getX() - radius, 0, block.getZ() + radius);
            p1 = new BlockVector(block.getX() + radius, block.getWorld().getMaxHeight(), block.getZ() - radius);

                player.sendMessage(p1 + " " + p2);

            ProtectedCuboidRegion region = new ProtectedCuboidRegion("plot_" + player.getName(), new BlockVector(p1), new BlockVector(p2));

            DefaultDomain owners = new DefaultDomain();
            owners.addPlayer(player.getName());
            region.setOwners(owners);

            plugin.getWorldGuard().getRegionManager(player.getWorld()).addRegion(region); // <--- NPE on this line --

            player.sendMessage(ChatColor.AQUA + "Claimed new land. " + region.getId());
        }
    }