Fix nullpointers.

app/Exceptions/Handler.php

@@ -35,6 +35,7 @@ use Illuminate\Session\TokenMismatchException;
 use Illuminate\Support\Arr;
 use Illuminate\Validation\ValidationException as LaravelValidationException;
 use League\OAuth2\Server\Exception\OAuthServerException;
+use Laravel\Passport\Exceptions\OAuthServerException as LaravelOAuthException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Throwable;
 
@@ -54,6 +55,7 @@ class Handler extends ExceptionHandler
             LaravelValidationException::class,
             NotFoundHttpException::class,
             OAuthServerException::class,
+            LaravelOAuthException::class,
             TokenMismatchException::class,
         ];