Description of problem:
Trying to change font in settings.

Version-Release number of selected component:
gnome-builder-3.16.0-1.fc22

Additional info:
reporter:       libreport-2.5.0
backtrace_rating: 4
cmdline:        /usr/bin/gnome-builder --gapplication-service
crash_function: gtk_tree_model_get_valist
executable:     /usr/bin/gnome-builder
global_pid:     12753
kernel:         4.0.0-0.rc5.git4.1.fc22.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 gtk_tree_model_get_valist at gtktreemodel.c:1797
 #1 gtk_tree_model_get at gtktreemodel.c:1759
 #2 gtk_font_chooser_widget_cell_data_func at gtkfontchooserwidget.c:820
 #3 apply_cell_attributes at gtkcellarea.c:1258
 #4 g_hash_table_foreach at ghash.c:1607
 #5 gtk_cell_area_real_apply_attributes at gtkcellarea.c:1287
 #6 gtk_cell_area_box_apply_attributes at gtkcellareabox.c:1311
 #7 _gtk_marshal_VOID__OBJECT_BOXED_BOOLEAN_BOOLEANv at gtkmarshalers.c:5040
 #8 _g_closure_invoke_va at gclosure.c:831
 #11 gtk_cell_area_apply_attributes at gtkcellarea.c:2376