Comment 2 for bug 857413

StacktraceTop:
 brasero_drive_settings_get_mapping_flags (value=0x7fffa81a89c0, variant=0x1375b80, user_data=<optimized out>) at brasero-drive-settings.c:113
 g_settings_binding_key_changed (settings=<optimized out>, key=<optimized out>, user_data=0xc8d330) at /build/buildd/glib2.0-2.29.92/./gio/gsettings.c:2582
 g_closure_invoke (closure=0x12302d0, return_value=0x0, n_param_values=2, param_values=0x12eca30, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=<optimized out>, detail=1110, instance=0x1144590, emission_return=0x0, instance_and_params=0x12eca30) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3272
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=0x7fffa81a8d28) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3003