From 4d7890d1f65f2541e0d56445e062acd65b8bce0c Mon Sep 17 00:00:00 2001
From: William Desportes <williamdes@wdes.fr>
Date: Mon, 19 Jul 2021 20:49:12 +0200
Subject: [PATCH] Fix "TypeError: strlen() expects parameter 1 to be string,
 null given"

Found on writing tests, should not happen

Signed-off-by: William Desportes <williamdes@wdes.fr>
---
 libraries/classes/Navigation/NavigationTree.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/classes/Navigation/NavigationTree.php b/libraries/classes/Navigation/NavigationTree.php
index de183dc1f2..3a3334933b 100644
--- a/libraries/classes/Navigation/NavigationTree.php
+++ b/libraries/classes/Navigation/NavigationTree.php
@@ -210,7 +210,7 @@ class NavigationTree
     {
         $retval = 0;
 
-        if (strlen($GLOBALS['db']) == 0) {
+        if (strlen($GLOBALS['db'] ?? '') === 0) {
             return $retval;
         }