From 9362c021ba7415f5019ce186fcfc68175f264de7 Mon Sep 17 00:00:00 2001
From: Ryuta Hamasaki <avosalmon@gmail.com>
Date: Sat, 18 Oct 2025 21:19:40 +0900
Subject: [PATCH] Filter out invalid middleware values

---
 src/Illuminate/Routing/RouteRegistrar.php |  2 ++
 tests/Routing/RouteRegistrarTest.php      | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/Illuminate/Routing/RouteRegistrar.php b/src/Illuminate/Routing/RouteRegistrar.php
index 52e1ae4d2130..6da02f501fef 100644
--- a/src/Illuminate/Routing/RouteRegistrar.php
+++ b/src/Illuminate/Routing/RouteRegistrar.php
@@ -121,6 +121,8 @@ public function attribute($key, $value)
         }
 
         if ($key === 'middleware') {
+            $value = array_filter(Arr::wrap($value));
+
             foreach ($value as $index => $middleware) {
                 $value[$index] = (string) $middleware;
             }
diff --git a/tests/Routing/RouteRegistrarTest.php b/tests/Routing/RouteRegistrarTest.php
index 3f6dd0961f81..34299d0bfe24 100644
--- a/tests/Routing/RouteRegistrarTest.php
+++ b/tests/Routing/RouteRegistrarTest.php
@@ -127,6 +127,23 @@ public function __toString()
         $this->assertSame(['one', 'two'], $this->getRoute()->middleware());
     }
 
+    public function testMiddlewareAsNull()
+    {
+        $this->router->middleware(null)->get('users', function () {
+            return 'all-users';
+        });
+
+        $this->seeResponse('all-users', Request::create('users', 'GET'));
+        $this->assertSame([], $this->getRoute()->middleware());
+
+        $this->router->get('users', function () {
+            return 'all-users';
+        })->middleware(null);
+
+        $this->seeResponse('all-users', Request::create('users', 'GET'));
+        $this->assertSame([], $this->getRoute()->middleware());
+    }
+
     public function testWithoutMiddlewareRegistration()
     {
         $this->router->middleware(['one', 'two'])->get('users', function () {