Comment 2 for bug 929075

StacktraceTop:
 g_type_check_instance (type_instance=0x975ea20) at /build/buildd/glib2.0-2.31.16/./gobject/gtype.c:4072
 g_signal_emit_valist (instance=0x975ea20, signal_id=221, detail=0, var_args=0xbface03c "x\035F\t\340\031F\tP\350%\n\230\341\314\t\316+\034\003P\350%\n\001") at /build/buildd/glib2.0-2.31.16/./gobject/gsignal.c:2966
 g_signal_emit (instance=0x975ea20, signal_id=221, detail=0) at /build/buildd/glib2.0-2.31.16/./gobject/gsignal.c:3090
 bamf_matcher_on_active_window_changed (proxy=0x9cce198, old_path=0xa18a1b8 "/org/ayatana/bamf/window58720260", new_path=0xa251988 "/org/ayatana/bamf/window23068676", matcher=0x975ea20) at /build/buildd/bamf-0.2.108/./lib/libbamf/bamf-matcher.c:194
 bamf_marshal_VOID__STRING_STRING (closure=0x9d360f0, return_value=0x0, n_param_values=3, param_values=0xa25e850, invocation_hint=0xbface210, marshal_data=0x0) at bamf-marshal.c:84
ThreadStacktrace: Cannot find new threads: generic error