Minor fix.

www/aptui/status.php

@@ -97,7 +97,8 @@ if (!$creator) {
 if (! (isset($this_user) && ISADMIN())) {
     # An experiment created by a real user, can be accessed by that user only.
     # Ditto a guest user; must be the same guest.
-    if (! ((get_class($creator) == "User" && $instance->CanView($this_user)) ||
+    if (! ((get_class($creator) == "User" && isset($this_user) &&
+            $instance->CanView($this_user)) ||
 	   (get_class($creator) == "GeniUser" &&
 	    isset($_COOKIE['quickvm_user']) &&
 	    $_COOKIE['quickvm_user'] == $creator->uuid()))) {