Why the deformGroups crash the game with version 0.5.6

"flexbodies": [
["mesh", "[group]:", "nonFlexMaterials"],
//glass
{"deformGroup":"GL83_windshield_break", "deformMaterialBase":"GL83_glass", "deformMaterialDamaged":"windshield_dmg"}
["GL83_windscreen", ["body", "roof", "pillar_a", "GL83_windshield"],[]{"deformSound":"GlassBreakSound1", "deformVolume":0.7}],

If i remove the red line the game works well but if this active the game crash every time with any deformGroup
why this happening with the new update 0.5.6 and it is a bug or not and how can fix this?
that's why my mod crash and i spent some time to find this problem
works perfect with 0.5.5

 

{"deformGroup":""},

You need one of these to close it.

{"deformGroup":"GL83_windshield_break","deformMaterialBase":"GL83_glass","deformMaterialDamaged":"windshield_dmg"},

An this one needs ac comma at the end.

 

forgot to write here but i have this
i thing i find the problem i didnt know it is a bug or a stupid thing, but if you have deformMaterialDamaged you must to attach something to it otherwise the game crash.... nice

 

That is good to know.