diff --git a/app/Http/Controllers/ShopifyInstallController.php b/app/Http/Controllers/ShopifyInstallController.php
index 6f207fa..12a57d0 100644
--- a/app/Http/Controllers/ShopifyInstallController.php
+++ b/app/Http/Controllers/ShopifyInstallController.php
@@ -8,7 +8,7 @@ use Illuminate\Support\Facades\Http;
 class ShopifyInstallController extends Controller
 {
     private string $clientId;
-    private string $clientSecret;
+    private ?string $clientSecret;
     private string $shop;
     private string $scopes = 'read_products,read_inventory,read_orders';