http://pkgs.fedoraproject.org/cgit/xscreensaver.git/tree/xscreensaver-5.12-test-passwd-segv-tty.patch

--- driver/passwd.c
+++ driver/passwd.c
@@ -205,7 +205,7 @@
 {
 # ifdef HAVE_SYSLOG
   struct passwd *pw = getpwuid (getuid ());
-  char *d = DisplayString (si->dpy);
+  char *d = (si->dpy ? DisplayString (si->dpy) : 0);
   char *u = (pw && pw->pw_name ? pw->pw_name : "???");
   int opt = 0;
   int fac = 0;