diff --git a/app/Http/Middleware/EnsureNovaMainDashboard.php b/app/Http/Middleware/EnsureNovaMainDashboard.php
new file mode 100644
index 000000000..e942aa2a9
--- /dev/null
+++ b/app/Http/Middleware/EnsureNovaMainDashboard.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Nova\Dashboards\Main;
+use Closure;
+use Illuminate\Http\Request;
+use Laravel\Nova\Nova;
+use Symfony\Component\HttpFoundation\Response;
+
+class EnsureNovaMainDashboard
+{
+    /**
+     * Ensure the Main dashboard is registered so /nova/dashboards/main resolves.
+     * Handles edge cases (e.g. Octane flushState, registration order).
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return \Symfony\Component\HttpFoundation\Response
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        if (! $this->isNovaDashboardRequest($request)) {
+            return $next($request);
+        }
+
+        $hasMain = collect(Nova::$dashboards)->contains(function ($dashboard) {
+            return $dashboard->uriKey() === 'main';
+        });
+
+        if (! $hasMain) {
+            Nova::dashboards([new Main]);
+        }
+
+        return $next($request);
+    }
+
+    private function isNovaDashboardRequest(Request $request): bool
+    {
+        $path = $request->path();
+
+        return $path === 'nova/dashboards/main'
+            || str_starts_with($path, 'nova/dashboards/')
+            || $path === 'nova-api/dashboards/main'
+            || str_starts_with($path, 'nova-api/dashboards/');
+    }
+}
diff --git a/config/nova.php b/config/nova.php
index 7ff8702b9..0f115c67c 100644
--- a/config/nova.php
+++ b/config/nova.php
@@ -75,6 +75,7 @@
         'web',
         HandleInertiaRequests::class,
         DispatchServingNovaEvent::class,
+        \App\Http\Middleware\EnsureNovaMainDashboard::class,
         BootTools::class,
     ],