[6.x] Fix @nocache TypeError when rendered outside a matched route

src/StaticCaching/Middleware/Cache.php

@@ -265,7 +265,11 @@ private function createLock($request): Lock
 
     public static function isBeingUsedOnCurrentRoute()
     {
-        return in_array(static::class, app('router')->gatherRouteMiddleware(request()->route()));
+        if (! $route = request()->route()) {
+            return false;
+        }
+
+        return in_array(static::class, app('router')->gatherRouteMiddleware($route));
     }
 
     private function outputRefreshResponse($request)

tests/StaticCaching/NocacheBladeTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Tests\StaticCaching;
+
+use Illuminate\Support\Facades\Blade;
+use Orchestra\Testbench\Attributes\DefineEnvironment;
+use PHPUnit\Framework\Attributes\Test;
+use Tests\TestCase;
+
+class NocacheBladeTest extends TestCase
+{
+    #[Test]
+    #[DefineEnvironment('bladeViewPaths')]
+    public function it_renders_the_view_inline_when_there_is_no_matched_route()
+    {
+        config(['statamic.static_caching.strategy' => 'half']);
+
+        $this->assertSame('<p>region</p>', trim(Blade::render('@nocache("nocache-probe")')));
+    }
+
+    public function bladeViewPaths($app)
+    {
+        $app['config']->set('view.paths', [
+            __DIR__.'/blade',
+            ...$app['config']->get('view.paths'),
+        ]);
+    }
+}

tests/StaticCaching/blade/nocache-probe.blade.php

@@ -0,0 +1 @@
+<p>region</p>