fixed warning when realuser is not set.

diff --git a/course/loginas.php b/course/loginas.php
index f9d967750c0ba5afdfc0ef9fd13ffbfc076f3b1e..5f01d9a032fc058e11aac66619f00023a55b1a90 100644 (file)
--- a/course/loginas.php
+++ b/course/loginas.php
@@ -17,7 +17,7 @@
         require_login($course->id);
     }
 
-    if ($USER->realuser) {   /// Reset user back to their real self
+    if (isset($USER->realuser)) {   /// Reset user back to their real self
         $USER = get_user_info_from_db("id", $USER->realuser);
         $USER->loggedin = true;
         $USER->site = $CFG->wwwroot;