While testing out your tool, I ran into a crash that got caught by
apport. But given that the stacktrace was incomplete, apport did not
allow me to report it.

I've uploaded the crash at:
https://people.debian.org/~rrs/tmp/_usr_lib_mdm_mdm-top.1000.crash

You may have a look at it if you have all the debug symbols enabled,
and install