Reproduced with Inkscape 0.48.1 on Mac OS X 10.5.8 (backtrace attached).
Not reproduced with upcoming 0.48.2 and 0.48+devel r10439.
Linking as duplicate to Bug #249035 “Undo crash when executing extensions”. Please add a comment here and revert the duplicate status if you don't agree and think these are different issues.
Reproduced with Inkscape 0.48.1 on Mac OS X 10.5.8 (backtrace attached).
Not reproduced with upcoming 0.48.2 and 0.48+devel r10439.
Linking as duplicate to Bug #249035 “Undo crash when executing extensions”. Please add a comment here and revert the duplicate status if you don't agree and think these are different issues.