From 66648c51f1a568d6e9cf596d0c8b87ce0372d5ee Mon Sep 17 00:00:00 2001
From: Jordane Vaspard <jordane.vaspard@laposte.net>
Date: Tue, 10 Oct 2023 13:26:09 +0200
Subject: [PATCH] [HttpKernel] Handle nullable callback of StreamedResponse

---
 src/Symfony/Component/HttpFoundation/StreamedResponse.php | 6 +++++-
 src/Symfony/Component/HttpKernel/HttpKernel.php           | 3 +--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/Symfony/Component/HttpFoundation/StreamedResponse.php b/src/Symfony/Component/HttpFoundation/StreamedResponse.php
index 5c7817e3c9af..37b6510b947d 100644
--- a/src/Symfony/Component/HttpFoundation/StreamedResponse.php
+++ b/src/Symfony/Component/HttpFoundation/StreamedResponse.php
@@ -56,8 +56,12 @@ public function setCallback(callable $callback): static
         return $this;
     }
 
-    public function getCallback(): \Closure
+    public function getCallback(): ?\Closure
     {
+        if (!isset($this->callback)) {
+            return null;
+        }
+
         return ($this->callback)(...);
     }
 
diff --git a/src/Symfony/Component/HttpKernel/HttpKernel.php b/src/Symfony/Component/HttpKernel/HttpKernel.php
index 4999870e4c55..d2cf4eaee27c 100644
--- a/src/Symfony/Component/HttpKernel/HttpKernel.php
+++ b/src/Symfony/Component/HttpKernel/HttpKernel.php
@@ -92,8 +92,7 @@ public function handle(Request $request, int $type = HttpKernelInterface::MAIN_R
         } finally {
             $this->requestStack->pop();
 
-            if ($response instanceof StreamedResponse) {
-                $callback = $response->getCallback();
+            if ($response instanceof StreamedResponse && $callback = $response->getCallback()) {
                 $requestStack = $this->requestStack;
 
                 $response->setCallback(static function () use ($request, $callback, $requestStack) {