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vendor/symfony/translation/Loader/IcuResFileLoader.php

@@ -70,7 +70,7 @@ class IcuResFileLoader implements LoaderInterface
      * @param array           $messages Used internally for recursive calls
      * @param string|null     $path     Current path being parsed, used internally for recursive calls
      */
-    protected function flatten(\ResourceBundle $rb, array &$messages = [], string $path = null): array
+    protected function flatten(\ResourceBundle $rb, array &$messages = [], ?string $path = null): array
     {
         foreach ($rb as $key => $value) {
             $nodePath = $path ? $path.'.'.$key : $key;