Comment 2 for bug 848464

StacktraceTop:
 brasero_image_type_chooser_get_format (self=0x0, format=0x7fff8d19893c) at brasero-image-type-chooser.c:253
 brasero_src_image_changed (dialog=0x1934480) at brasero-src-image.c:330
 brasero_src_image_clicked (button=<optimized out>) at brasero-src-image.c:484
 g_closure_invoke (closure=0x130baf0, return_value=0x0, n_param_values=1, param_values=0x19811a0, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.29.90/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=0x1934480, emission_return=0x0, instance_and_params=0x19811a0) at /build/buildd/glib2.0-2.29.90/./gobject/gsignal.c:3202