Comment 2 for bug 731855

StacktraceTop:
 ?? ()
 g_cclosure_marshal_VOID__POINTER (closure=0x8a2fca0, return_value=0x0, n_param_values=2, param_values=0x88be400, invocation_hint=0xbff1fc10, marshal_data=0x0) at /build/buildd/glib2.0-2.28.2/./gobject/gmarshal.c:603
 g_closure_invoke (closure=0x8a2fca0, return_value=0x0, n_param_values=2, param_values=0x88be400, invocation_hint=0xbff1fc10) at /build/buildd/glib2.0-2.28.2/./gobject/gclosure.c:767
 signal_emit_unlocked_R (node=0x892bb70, detail=0, instance=0x8873060, emission_return=0x0, instance_and_params=0x88be400) at /build/buildd/glib2.0-2.28.2/./gobject/gsignal.c:3252
 g_signal_emit_valist (instance=0x8873060, signal_id=240, detail=0, var_args=0xbff1fdd0 "\001") at /build/buildd/glib2.0-2.28.2/./gobject/gsignal.c:2983