Aggiornato Composer

vendor/symfony/http-kernel/DataCollector/AjaxDataCollector.php

@@ -21,7 +21,7 @@ use Symfony\Component\HttpFoundation\Response;
  */
 class AjaxDataCollector extends DataCollector
 {
-    public function collect(Request $request, Response $response, \Throwable $exception = null)
+    public function collect(Request $request, Response $response, ?\Throwable $exception = null)
     {
         // all collecting is done client side
     }