!T1ToFont crash

I am trying to convert urw-dingbats from PS font to riscos format.
When I attempt to do this it always causes a hard crash.
This is on a raspberry pi, I have tried all versions of the alignment exceptions.
It is a hard crash with no response at all.

!TTF2f sometimes (usually not) hard crashes when finishing the write to !Fonts, so I don’t know whether this is a related issue or a separate one.
Since updating the firmware I’ve not had TT2f crash yet, although it didn’t crash often (one out of ten)