/usr/lib/gnome-session/gnome-session-binary:5:g_settings_set_property:object_set_property:g_object_new_internal:g_object_new_valist:g_object_new

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding gnome-session. This problem was most recently seen with package version 3.20.2-1ubuntu7, the problem page at https://errors.ubuntu.com/problem/26f065f3c1723b15b602ddcd61457a07fabfdf40 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.