From 7c1be89de64a72c86726f2443dc45e0b22b7dc7a Mon Sep 17 00:00:00 2001
From: Richard Lobb <trampgeek@gmail.com>
Date: Mon, 13 May 2024 19:42:40 +1200
Subject: [PATCH] Prevent PHP warnings when language undefined (probably due to
 a missing prototype).

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

diff --git a/renderer.php b/renderer.php
index 7de8b646..1904bc73 100644
--- a/renderer.php
+++ b/renderer.php
@@ -575,7 +575,7 @@ public function correct_response(question_attempt $qa) {
             }
         }
 
-        $uclang = ucwords($currentlanguage);
+        $uclang = ucwords($currentlanguage ?? '');  // Current language can be null when prototype missing.
         $heading = get_string('asolutionis', 'qtype_coderunner');
         $heading = substr($heading, 0, strlen($heading) - 1) . ' (' . $uclang . ')';
         $divid = 'id_div_' . $fieldname;