Description of problem:
Ran control center from an Xfce environment, tried to go to "Users".

Version-Release number of selected component:
control-center-3.16.3-1.fc22

Additional info:
reporter:       libreport-2.6.2
backtrace_rating: 4
cmdline:        gnome-control-center
crash_function: _g_log_abort
executable:     /usr/bin/gnome-control-center
global_pid:     9803
kernel:         4.1.6-200.fc22.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 _g_log_abort at gmessages.c:315
 #3 g_settings_set_property at gsettings.c:526
 #4 object_set_property at gobject.c:1415
 #5 g_object_new_internal at gobject.c:1808
 #6 g_object_new_valist at gobject.c:2033
 #8 g_settings_new at gsettings.c:898
 #9 cc_user_panel_init at um-user-panel.c:1729
 #10 g_type_create_instance at gtype.c:1870
 #11 g_object_new_internal at gobject.c:1774
 #12 g_object_new_valist at gobject.c:2033