From 38f5c818cbd53ba44f47573712b42562b1451241 Mon Sep 17 00:00:00 2001
From: Sara Arjona <sara@moodle.com>
Date: Fri, 24 Mar 2023 12:42:53 +0100
Subject: [PATCH] MDL-77735 core: Check $CFG->lang isset

In some cases, $CFG->lang might not be set, and this is causing a
Notice to be displayed when, for instance, database connection fails.
This patch should fix this case.
---
 lib/weblib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/weblib.php b/lib/weblib.php
index eaf6cbba0a3..e93b369e321 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -2275,7 +2275,7 @@ function get_html_lang($dir = false) {
     global $CFG;
 
     $currentlang = current_language();
-    if ($currentlang !== $CFG->lang && !get_string_manager()->translation_exists($currentlang)) {
+    if (isset($CFG->lang) && $currentlang !== $CFG->lang && !get_string_manager()->translation_exists($currentlang)) {
         // Use the default site language when the current language is not available.
         $currentlang = $CFG->lang;
         // Fix the current language.