/usr/bin/xfdesktop:11:g_type_check_instance_is_fundamentally_a:g_object_unref:g_file_icon_finalize:g_object_unref:g_proxy_mount_update

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding xfdesktop4. This problem was most recently seen with package version 4.12.3-4ubuntu1, the problem page at https://errors.ubuntu.com/problem/86d99d746a22dbaf21bc6b1fb05d5a4f9936d5fa 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 and are a software developer, you can request it at http://forms.canonical.com/reports/.