From cf199b44486a7e04a9bf84d4fafccf944f673b1e Mon Sep 17 00:00:00 2001
From: Damyon Wiese <damyon@moodle.com>
Date: Mon, 14 Nov 2016 17:16:38 +0800
Subject: [PATCH] MDL-56834 boost: Be cautious about nodes in the navbar

Some pages (fresh install) don't have the navbar yet, so check for null.
---
 theme/boost/classes/output/core_renderer.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/theme/boost/classes/output/core_renderer.php b/theme/boost/classes/output/core_renderer.php
index 47181377228..48da10b7b1e 100644
--- a/theme/boost/classes/output/core_renderer.php
+++ b/theme/boost/classes/output/core_renderer.php
@@ -619,7 +619,7 @@ class core_renderer extends \core_renderer {
                 $navbarnode = end($items);
                 // We only want to show the menu on the first page of the activity. This means
                 // the breadcrumb has no additional nodes.
-                if ($navbarnode->key == $node->key && $navbarnode->type == $node->type) {
+                if ($navbarnode && ($navbarnode->key == $node->key && $navbarnode->type == $node->type)) {
                     $buildmenu = true;
                 }
             }
@@ -635,7 +635,7 @@ class core_renderer extends \core_renderer {
             $items = $this->page->navbar->get_items();
             $navbarnode = end($items);
 
-            if ($navbarnode->key == 'participants') {
+            if ($navbarnode && ($navbarnode->key == 'participants')) {
                 $node = $this->page->settingsnav->find('users', navigation_node::TYPE_CONTAINER);
                 if ($node) {
                     // Build an action menu based on the visible nodes from this navigation tree.