Comment 2 for bug 930575

StacktraceTop:
 g_type_check_instance (type_instance=0xa23fd60) at /build/buildd/glib2.0-2.31.16/./gobject/gtype.c:4072
 g_signal_emit_valist (instance=0xa23fd60, signal_id=208, detail=0, var_args=0xbfa6b5ec "\350a\374\tG'\033\263\364\357\033\263`;\202\n\252\233\033\263H\366K\n\300\331\254\n@\200q\n`\375#\nH\366K\n\260\024\036\vH\366K\n") at /build/buildd/glib2.0-2.31.16/./gobject/gsignal.c:2966
 g_signal_emit (instance=0xa23fd60, signal_id=208, detail=0) at /build/buildd/glib2.0-2.31.16/./gobject/gsignal.c:3090
 bamf_matcher_on_view_closed (proxy=0xa4bf648, path=0xaacd9c0 "/org/ayatana/bamf/window33554434", type=0xa718040 "window", matcher=0xa23fd60) at /build/buildd/bamf-0.2.108/./lib/libbamf/bamf-matcher.c:156
 bamf_marshal_VOID__STRING_STRING (closure=0xa56e5e8, return_value=0x0, n_param_values=3, param_values=0xa823b60, invocation_hint=0xbfa6b7a0, marshal_data=0x0) at bamf-marshal.c:84