Comment 30 for bug 391398

HAaaa the typo is actually upstream it seems:

http://git.gnome.org/cgit/gtk+/commit/?id=3bf1c7adadb1fda69e63fc6fe0f3698d937a1b80

towards the end.

It's only in libgail. Could you try disabling assistive technologies and see if it still segfaults ?
System/Preferences/Assistive Technologies and untick enable assistive tech.

I'll upload a new version of the package to fix it and report upstream to.