From 92eed88a4884ee14fc49a0853c4207023bea3c75 Mon Sep 17 00:00:00 2001
From: Mathias Chouet <mathias@tela-botanica.org>
Date: Mon, 1 Aug 2016 11:11:00 +0200
Subject: [PATCH] Protection against non-existing property "hiddensections" in
 $COURSE

---
 footer.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/footer.php b/footer.php
index 98b4b98..3094155 100644
--- a/footer.php
+++ b/footer.php
@@ -105,7 +105,7 @@ function draw_navbuttons() {
         if ($mod->sectionnum > 0 && $sectionnum != $mod->sectionnum) {
             $thissection = $sections[$mod->sectionnum];
 
-            if ($thissection->visible || !$COURSE->hiddensections ||
+            if ($thissection->visible || (property_exists($COURSE, "hiddensections") && !$COURSE->hiddensections) ||
                 has_capability('moodle/course:viewhiddensections', $context)
             ) {
                 $sectionnum = $mod->sectionnum;