Comment 2 for bug 1567661

UPDATE:

I added the path effect to subsequent alternative paths
with no issues, so I guess it's something to do with that
particular path (see arrow in attached screenshot).

This path which caused the problem is just an ordinary
closed path as far as I can tell.

One workaround that seemed to remedy the bug was to
select this serif/crossbar path "Break Apart", "Union"
and then try adding the Fillet/Chamfer effect again.

Inkscape didn't crash on this occasion. Hope this info
is of some help to making the effect more stable.