diff --git a/workloads/ecommerce/components/catalog/catalog-client.tsx b/workloads/ecommerce/components/catalog/catalog-client.tsx
index 5cbf1cd..eb4f3ea 100644
--- a/workloads/ecommerce/components/catalog/catalog-client.tsx
+++ b/workloads/ecommerce/components/catalog/catalog-client.tsx
@@ -144,8 +144,9 @@ export function CatalogClient({
     filtered.forEach((product, index) => {
       items.push({ type: "product", product });
       const isLast = index === filtered.length - 1;
-      if (!isLast && (index + 1) % PROMO_TILE_INTERVAL === 0) {
-        items.push({ type: "promo", category: promoRoots[promoIndex % promoRoots.length] });
+      const promoCategory = promoRoots[promoIndex % promoRoots.length];
+      if (!isLast && (index + 1) % PROMO_TILE_INTERVAL === 0 && promoCategory) {
+        items.push({ type: "promo", category: promoCategory });
         promoIndex += 1;
       }
     });