int radius = 4;

        ArrayList<Block> blocks = new ArrayList<>();

        for (int x = sendLocation.getBlockX() - radius; x <= sendLocation.getBlockX() + radius; x++)
            for (int y = sendLocation.getBlockY(); y <= sendLocation.getBlockY() + radius; y++)
                for (int z = sendLocation.getBlockZ() - radius; z <= sendLocation.getBlockZ() + radius; z++)
                    blocks.add(sendLocation.getWorld().getBlockAt(x, y, z));


        for (Block block : blocks)
            if (!block.getType().equals(Material.AIR))
                return EvoriyaPlugin.formattedPrefix("§a§lTP") + "§cDiese Location ist nicht sicher.";