Comment 6 for bug 956416

The relevant piece of code, as far as I can see is this:

protected static void sig_handler (int sig) {
    warning ("Caught signal (%d), exiting", sig);
    Granite.app.quit_mainloop ();
}

The warning still gets printed, but then it goes wrong.
- For one it uses the deprecated Granite.app static variable.
- quit_mainloop is a virtual function according to valadoc, so I guess this is the nullpointer which gets dereferenced

It seems that the correct way to end would be to use Gtk.main_quit(), see http://www.valadoc.org/gtk+-3.0/Gtk.main_quit.html