Change operator or to ||

lib.php

@@ -30,7 +30,7 @@ function local_hshexport_extend_navigation_course($navigation, $course, $context
     global $PAGE, $SITE;
 
     // Only add this settings item on non-site course pages.
-    if (!$PAGE->course or $PAGE->course->id == $SITE->id) {
+    if (!$PAGE->course || $PAGE->course->id == $SITE->id) {
         return;
     }