I use official version (from download page) under linux (debian).
Running SweetHome3D & SweetHome3D-Java3D-1_5_2 it's OK (produce the expected svg result).

I receive the same error (in terminal & 0 size file) ONLY when I use nimbus.
(-Dswing.defaultlaf=javax.swing.plaf.nimbus.NimbusLookAndFeel)
Maybe is not the only one issue under this settings.

With SweetHome3D-6.6 all work OK.