Comment 2 for bug 741403

StacktraceTop:
 ?? ()
 g_closure_invoke (closure=0x104f660, return_value=0x0, n_param_values=2, param_values=0x1167040, invocation_hint=0x7fff3ca1e160) at /build/buildd/glib2.0-2.28.4/./gobject/gclosure.c:767
 signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0x1050020, emission_return=0x0, instance_and_params=0x1167040) at /build/buildd/glib2.0-2.28.4/./gobject/gsignal.c:3252
 g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=<value optimized out>) at /build/buildd/glib2.0-2.28.4/./gobject/gsignal.c:2983
 g_signal_emit (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>) at /build/buildd/glib2.0-2.28.4/./gobject/gsignal.c:3040