--- gnome-session-3.6.2/gnome-session/gsm-systemd.c	2012-12-23 02:05:57.058498886 +0400
+++ gnome-session-3.6.2/gnome-session/gsm-systemd.patched.c	2012-12-23 02:07:40.859374145 +0400
@@ -358,13 +358,17 @@
                                       G_MAXINT,
                                       NULL,
                                       NULL);
-        g_variant_get (res, "(s)", &rv);
-        g_variant_unref (res);
+        if (res) {
+          g_variant_get (res, "(s)", &rv);
+          g_variant_unref (res);
 
-        can_stop = g_strcmp0 (rv, "yes") == 0 ||
-                   g_strcmp0 (rv, "challenge") == 0;
+          can_stop = g_strcmp0 (rv, "yes") == 0 ||
+                     g_strcmp0 (rv, "challenge") == 0;
 
-        g_free (rv);
+          g_free (rv);
+        } else {
+          can_stop = (0 != 1); /* false */
+        }
 
         return can_stop;
 }