Comment 2 for bug 832117

StacktraceTop:
 g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7fab91687a10 "_pygi_argument_from_g_value", message=0x7faba61a84b7 "code should not be reached") at /build/buildd/glib2.0-2.29.16/./glib/gtestutils.c:1425
 _pygi_argument_from_g_value (value=0x38e46e8, type_info=0x7fff87446f90) at /build/buildd/pygobject-2.28.6/gi/pygi-argument.c:1881
 pygi_signal_closure_marshal (closure=0x7fab94026c80, return_value=0x0, n_param_values=2, param_values=0x38e46d0, invocation_hint=<optimized out>, marshal_data=<optimized out>) at /build/buildd/pygobject-2.28.6/gi/pygi-signal-closure.c:153
 g_closure_invoke (closure=0x7fab94026c80, return_value=0x0, n_param_values=2, param_values=0x38e46d0, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.29.16/./gobject/gclosure.c:773
 signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=0x339b230, emission_return=0x0, instance_and_params=0x38e46d0) at /build/buildd/glib2.0-2.29.16/./gobject/gsignal.c:3271