All polygons without material

Dear Support Team,

I want to find all polygons (polygons and soil polygons) without assigned material (no assigned material) in PLAXIS 2D.

The most obvious way is to use groupfiltered command. 
According to the Command reference we have eg. groupfiltered Plates "Material!=", that groups a list of all plates that have a material assigned to them. groupfiltered Plates "Material=" — groups a list of all plates that do not have a material assigned to them.

If I try to use eg. groupfiltered Polygons "Material!=", it does not work. 
Here we have five polygons for embankment. One of the layers (one polygons) does not have material:

If I use groupfiltered Polygons "Material!=", PLAXIS gives me:

Also I have tried tabulate and filter commands:

Could you please help me to group or to find all polygons without assigned material?

Thank you in advance.

UPD. 

I have found that groupfiltered Soils "Material=" helps me, but it does not help to see and to choose polygons with these Soils.

Could you please help me with it?

Thank you!

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