diff --git a/extend.php b/extend.php
index b4680d5..5bae177 100644
--- a/extend.php
+++ b/extend.php
@@ -16,6 +16,7 @@ use Flarum\Http\Middleware\AuthenticateWithHeader;
 use Flarum\Http\Middleware\CheckCsrfToken;
 use FoskyM\OAuthCenter\Middlewares\ResourceScopeMiddleware;
 use FoskyM\OAuthCenter\Middlewares\UnsetCsrfMiddleware;
+use FoskyM\OAuthCenter\Middlewares\UserCredentialsMiddleware;
 
 return [
     (new Extend\Frontend('forum'))
@@ -54,5 +55,6 @@ return [
     (new Extend\Middleware('api'))
         ->insertAfter(AuthenticateWithHeader::class, ResourceScopeMiddleware::class),
     (new Extend\Middleware('forum'))
-        ->insertBefore(CheckCsrfToken::class, UnsetCsrfMiddleware::class),
+        ->insertBefore(CheckCsrfToken::class, UnsetCsrfMiddleware::class)
+        ->insertAfter(CheckCsrfToken::class, UserCredentialsMiddleware::class),
 ];
diff --git a/src/Api/Controller/ShowClientController.php b/src/Api/Controller/ShowClientController.php
index 726246b..9b4ebe5 100644
--- a/src/Api/Controller/ShowClientController.php
+++ b/src/Api/Controller/ShowClientController.php
@@ -4,7 +4,6 @@ namespace FoskyM\OAuthCenter\Api\Controller;
 
 use Flarum\Api\Controller\AbstractListController;
 use Flarum\Http\RequestUtil;
-use Flarum\User\Exception\NotAuthenticatedException;
 use Illuminate\Support\Arr;
 use Psr\Http\Message\ServerRequestInterface;
 use Tobscure\JsonApi\Document;
@@ -22,7 +21,7 @@ class ShowClientController extends AbstractListController
         $actor->assertRegistered();
 
         if (!$actor->hasPermission('foskym-oauth-center.use-oauth')) {
-            throw new NotAuthenticatedException();
+            return [];
         }
 
         $client = Client::where('client_id', $client_id)->get();
diff --git a/src/Controllers/AuthorizeController.php b/src/Controllers/AuthorizeController.php
index 2270376..2a57c5e 100644
--- a/src/Controllers/AuthorizeController.php
+++ b/src/Controllers/AuthorizeController.php
@@ -9,7 +9,6 @@
  * file that was distributed with this source code.
  */
 namespace FoskyM\OAuthCenter\Controllers;
-use Flarum\User\Exception\NotAuthenticatedException;
 use Flarum\User\User;
 use Flarum\Http\RequestUtil;
 use FoskyM\OAuthCenter\OAuth;
@@ -35,7 +34,7 @@ class AuthorizeController implements RequestHandlerInterface
         $actor->assertRegistered();
 
         if (!$actor->hasPermission('foskym-oauth-center.use-oauth')) {
-            throw new NotAuthenticatedException();
+            return new JsonResponse([ 'error' => 'no_permission', 'error_description' => 'Don\'t have the permissions of oauth' ]);
         }
 
         $params = $request->getParsedBody();
diff --git a/src/Middlewares/UserCredentialsMiddleware.php b/src/Middlewares/UserCredentialsMiddleware.php
new file mode 100644
index 0000000..5273a5d
--- /dev/null
+++ b/src/Middlewares/UserCredentialsMiddleware.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace FoskyM\OAuthCenter\Middlewares;
+
+use Flarum\User\User;
+use FoskyM\OAuthCenter\OAuth;
+use FoskyM\OAuthCenter\Storage;
+use Illuminate\Support\Arr;
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Laminas\Diactoros\Response\JsonResponse;
+use FoskyM\OAuthCenter\Models\Scope;
+class UserCredentialsMiddleware implements MiddlewareInterface
+{
+    public function process(Request $request, RequestHandlerInterface $handler): Response
+    {
+        $uri = [
+            '/oauth/token',
+        ];
+        $path = $request->getUri()->getPath();
+        if (in_array($path, $uri) && Arr::get($request->getParsedBody(), 'grant_type', '') === 'password') {
+            if ($user = User::where('username', Arr::get($request->getParsedBody(), 'username', ''))->first()) {
+                if (!$user->hasPermission('foskym-oauth-center.use-oauth')) {
+                    return new JsonResponse([ 'error' => 'no_permission', 'error_description' => 'Don\'t have the permissions of oauth' ]);
+                }
+            }
+        }
+
+        return $handler->handle($request);
+    }
+}