diff --git a/src/Instrumentation/Symfony/src/MessengerInstrumentation.php b/src/Instrumentation/Symfony/src/MessengerInstrumentation.php
index 42fb0c16..6fbdcc2c 100644
--- a/src/Instrumentation/Symfony/src/MessengerInstrumentation.php
+++ b/src/Instrumentation/Symfony/src/MessengerInstrumentation.php
@@ -150,7 +150,7 @@ public static function register(): void
             post: static function (
                 SenderInterface $sender,
                 array $params,
-                Envelope $result,
+                ?Envelope $result,
                 ?\Throwable $exception
             ): void {
                 $scope = Context::storage()->scope();