This is a bit difficult to make happen but you know someone will hit it. I did.
1) Load your dxf file.
2) Select layers.
3) Select an object.
4) Select profile.
5) Right click on the newly created profile - do NOT select it.
6) Delete.
7) Continue through the Unhandled Exception.

Repeat 5 & 6.
9) Roll on the floor laughing while your file disappears!
Cheers,
Walt