Custom data are lost if model crashes

Thanks. I have one more issue. My rhino crashed for some reason now the model defined material throwing error.

Hi @asisnath, this is a different issue. How did you make your “SGA_Roof_Vents_6mm_Clear” construction:

I just made a custom glass frome existing material. Ijust deleted the shade and aperture constructuion and rewrote it. It working fine again. When it crashes the data somehow deletes.