diff --git a/src/modules/cart/cart.service.ts b/src/modules/cart/cart.service.ts
index c636156..1c45c40 100644
--- a/src/modules/cart/cart.service.ts
+++ b/src/modules/cart/cart.service.ts
@@ -24,8 +24,12 @@ class CartService {
 
   async getCartS(userId: string) {
     const doc = (await this.cartRepo.getCartWithAggregate(userId))[0] as ICart;
+    if (!doc) {
+      throw new BadRequestError(CartMessage.CartNotFound);
+    }
     const cart = CartDTO.transformCart(doc);
-    const cartShipmentItems = await this.cartShipItemRepo.getCartShipmentItems(cart._id);
+
+    const cartShipmentItems = await this.cartShipItemRepo.getCartShipmentItems(doc._id.toString());
     const recommended = await this.getRecommendedProducts(doc);
     return { cart: { ...cart, cartShipmentItems }, recommended };
   }