Invisible cubes inside of smoke

Hello. I ran into a strange problem with smoke in cycles

There is invisible cubes inside of smoke - is it posible to fix smoke?

Here is my domain smoke material

Blender 2.80 Beta

Looks like your domain is ‘grainy’. Hard to tell without a .blend.
Maybe increase the resolution or use Adaptive Domain.

now i on vacation and don’t have my working files with me - but on next monday i will upload it here

Here is my .blend (packed with all textures)