diff -up gnome-screensaver-2.25.2/src/gs-grab-x11.c.jx gnome-screensaver-2.25.2/src/gs-grab-x11.c

--- gnome-screensaver-2.25.2/src/gs-grab-x11.c.jx	2008-11-13 15:06:55.000000000 -0500

+++ gnome-screensaver-2.25.2/src/gs-grab-x11.c	2009-02-26 10:07:05.000000000 -0500

@@ -118,7 +118,12 @@ static void

 xorg_lock_smasher_set_active (GSGrab  *grab,

                               gboolean active)

 {

-        int status;

+        int status, event, error;

+

+	if (!XF86MiscQueryExtension (GDK_DISPLAY (), &event, &error)) {

+		gs_debug ("No XFree86-Misc extension present");

+		return;

+	}

         if (active) {

                 gs_debug ("Enabling the x.org grab smasher");