Causing an infinite loop

    @Override
    public void generate(Random random, int chunkX, int chunkZ, World world, IChunkGenerator chunkGenerator, IChunkProvider chunkProvider)
    {
        int blockX = chunkX * 16;
        int blockZ = chunkZ * 16;

        BlockPos topBlock = world.getTopSolidOrLiquidBlock(new BlockPos(blockX, 90, blockZ));
        System.out.println("Top block: " + topBlock.getX() + ", " + topBlock.getY() + ", " + topBlock.getZ());
        world.setBlockState(topBlock, Blocks.NETHER_BRICK.getDefaultState());
    }