From 9e68a0245848121db47e70fde9199c7882e7fb67 Mon Sep 17 00:00:00 2001
From: Paul Holden <paulh@moodle.com>
Date: Tue, 22 Aug 2023 17:55:43 +0100
Subject: [PATCH] MDL-79118 output: account for empty node/current URL path
 element.

---
 lib/classes/navigation/output/primary.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/classes/navigation/output/primary.php b/lib/classes/navigation/output/primary.php
index f55dc8c8c4f..e1f36780bd3 100644
--- a/lib/classes/navigation/output/primary.php
+++ b/lib/classes/navigation/output/primary.php
@@ -194,12 +194,15 @@ class primary implements renderable, templatable {
         $current = parse_url($FULLME ?? '');
 
         $pathmatches = false;
+
         // Exact match of the path of node and current url.
-        if ($nodeurl['path'] === $current['path']) {
+        $nodepath = $nodeurl['path'] ?? '/';
+        $currentpath = $current['path'] ?? '/';
+        if ($nodepath === $currentpath) {
             $pathmatches = true;
         }
         // The current url may be trailed by a index.php, otherwise it's the same as the node path.
-        if (!$pathmatches && $nodeurl['path'] . 'index.php' === $current['path']) {
+        if (!$pathmatches && $nodepath . 'index.php' === $currentpath) {
             $pathmatches = true;
         }
         // No path did match, so the node can't be active.