diff --git a/src/services/purchaseService.ts b/src/services/purchaseService.ts
index 7e525168..773af41c 100644
--- a/src/services/purchaseService.ts
+++ b/src/services/purchaseService.ts
@@ -63,7 +63,7 @@ export const handlePurchase = async (
                 ? manifest.VendorInfo.ItemManifest.find(x => x.Id.$oid == ItemId)
                 : manifest.VendorInfo.ItemManifest.find(x => x.StoreItem == purchaseRequest.PurchaseParams.StoreItem);
             if (!offer) {
-                throw new Error(`unknown vendor offer: ${ItemId}`);
+                throw new Error(`unknown vendor offer: ${ItemId ? ItemId : purchaseRequest.PurchaseParams.StoreItem}`);
             }
             if (offer.ItemPrices) {
                 handleItemPrices(