Version-Release number of selected component:
gnome-shell-3.14.3-1.fc21

Additional info:
reporter:       libreport-2.3.0
backtrace_rating: 4
cmdline:        /usr/bin/gnome-shell
crash_function: meta_group_new
executable:     /usr/bin/gnome-shell
kernel:         3.17.7-300.fc21.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #4 meta_group_new at x11/group.c:57
 #5 meta_window_compute_group at x11/group.c:165
 #6 meta_window_group_leader_changed at x11/group.c:200
 #7 reload_wm_hints at x11/window-props.c:1595
 #8 reload_prop_value at x11/window-props.c:199
 #9 meta_window_reload_property_from_xwindow at x11/window-props.c:110
 #10 process_property_notify at x11/window-x11.c:2108
 #11 meta_window_x11_property_notify at x11/window-x11.c:2117
 #12 handle_other_xevent at x11/events.c:1421
 #13 meta_display_handle_xevent at x11/events.c:1733