This bug was reported in the fedora bug tracker, and i just hit it also.

I seem to be able to sporadically re-create this issue when removing applications in the "installed" tab.

See the bug
https://bugzilla.redhat.com/show_bug.cgi?id=1013227

for all the further info supplied by ABRT.


Version-Release number of selected component:
gnome-software-3.10.0-1.fc20

Additional info:
reporter:       libreport-2.1.7
backtrace_rating: 4
cmdline:        gnome-software
crash_function: _g_log_abort
executable:     /usr/bin/gnome-software
kernel:         3.11.1-300.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #2 _g_log_abort at gmessages.c:255
 #5 pango_layout_check_lines at pango-layout.c:3868
 #6 pango_layout_get_extents_internal at pango-layout.c:2539
 #7 pango_layout_get_extents at pango-layout.c:2734
 #8 gtk_label_get_measuring_layout at gtklabel.c:3251
 #9 gtk_label_get_preferred_layout_size at gtklabel.c:3577
 #10 gtk_label_get_preferred_size at gtklabel.c:3641
 #11 gtk_widget_query_size_for_orientation at gtksizerequest.c:180
 #12 gtk_widget_compute_size_for_orientation at gtksizerequest.c:390
 #13 gtk_widget_get_preferred_width at gtksizerequest.c:490