Comment 2 for bug 838765

StacktraceTop:
 g_type_check_instance_cast (type_instance=0x9eb2998, iface_type=80) at /build/buildd/glib2.0-2.29.16/./gobject/gtype.c:3985
 gtk_range_accessible_value_changed (adjustment=0x9f9f788, data=0x9eb2998) at /build/buildd/gtk+3.0-3.1.12/./gtk/a11y/gtkrangeaccessible.c:38
 g_cclosure_marshal_VOID__VOID (closure=0x9ffc4d0, return_value=0x0, n_param_values=1, param_values=0xa0992c0, invocation_hint=0xbffaec70, marshal_data=0x0) at /build/buildd/glib2.0-2.29.16/./gobject/gmarshal.c:85
 g_closure_invoke (closure=0x9ffc4d0, return_value=0x0, n_param_values=1, param_values=0xa0992c0, invocation_hint=0xbffaec70) at /build/buildd/glib2.0-2.29.16/./gobject/gclosure.c:773
 signal_emit_unlocked_R (node=0x9f420b0, detail=0, instance=0x9f9f788, emission_return=0x0, instance_and_params=0xa0992c0) at /build/buildd/glib2.0-2.29.16/./gobject/gsignal.c:3271