/usr/bin/xfce4-appfinder:11:g_type_check_instance_is_a:xfconf_g_property_channel_disconnect:closure_invoke_notifiers:g_closure_unref:handler_unref_R

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding xfce4-appfinder. This problem was most recently seen with package version 4.12.0-2ubuntu3, the problem page at https://errors.ubuntu.com/problem/1953a0e5f97e93c0e17daed1883f6c163340364e 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/.