diff --git a/scripts/lang_functions.php b/scripts/lang_functions.php
index 56158a469..af1e2ab3b 100644
--- a/scripts/lang_functions.php
+++ b/scripts/lang_functions.php
@@ -316,7 +316,7 @@ function save_key($key, $value, $path) {
     $file = file_get_contents($filePath);
     $file = (array) json_decode($file);
     $value = html_entity_decode($value);
-    if ($file[$key] != $value) {
+    if (!isset($file[$key]) || $file[$key] != $value) {
         $file[$key] = $value;
         ksort($file);
         file_put_contents($filePath, str_replace('\/', '/', json_encode($file, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT)));