diff --git a/lib/outputrenderers.php b/lib/outputrenderers.php
index 84c80b886c4..da020e47540 100644
--- a/lib/outputrenderers.php
+++ b/lib/outputrenderers.php
@@ -2656,7 +2656,7 @@ class core_renderer_ajax extends core_renderer {
      * @return string A template fragment for a fatal error
      */
     public function fatal_error($message, $moreinfourl, $link, $backtrace, $debuginfo = null) {
-        global $FULLME, $USER;
+        global $CFG;
 
         $this->page->set_context(null); // ugly hack - make sure page context is set to something, we do not want bogus warnings here