Error while saving as obj

Hi when I duplicate mesh and try save scene as obj it throws error every time.
Steps:
 - make cube
 - pres '4' and duplicate mesh
 - try save scene as obj
 - error is displayed : null reference exception

Thanks.

i wasn't able to recreate this issue, im using the march21a build, followed your steps, and no errors.

I can't reproduce either. Can you pass over the full error message?

Ok, I found the bug and will fix it tomorrow.

Thanks, and sorry for not mentioning nVil version - I used newest one march21a