Comment 2 for bug 854521

StacktraceTop:
 type_check_is_value_type_U (type=12297829382473034410) at /build/buildd/glib2.0-2.29.92/./gobject/gtype.c:4084
 g_type_check_value_holds (value=0x7087a8, type=72) at /build/buildd/glib2.0-2.29.92/./gobject/gtype.c:4133
 g_value_get_boxed (value=0x7087a8) at /build/buildd/glib2.0-2.29.92/./gobject/gboxed.c:417
 gtk_widget_draw_marshaller (closure=0x8007b0, return_value=0x7fffff734e00, n_param_values=2, param_values=0x708790, invocation_hint=<optimized out>, marshal_data=<optimized out>) at /build/buildd/gtk+3.0-3.1.90/./gtk/gtkwidget.c:815
 g_closure_invoke (closure=0x8007b0, return_value=0x7fffff734e00, n_param_values=2, param_values=0x708790, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gobject/gclosure.c:774