Comment 0 for bug 1287996

Steps to reproduce:

Create a ellipse, convert to path.
Create another ellipse, convert or not to path -both crash-,
Group both.
Apply Bend or Envelope
Move a path parameter.
Ctrl-Z tree times.
Crash.

http://pastebin.com/6Ng4SEeM

Sometimes have another backtrace, but i coulden`t reproduce in a few oportunities.