diff --git a/src/layouts/quote/quote.vue b/src/layouts/quote/quote.vue
index 5c903ea7e..fe29401b6 100644
--- a/src/layouts/quote/quote.vue
+++ b/src/layouts/quote/quote.vue
@@ -92,7 +92,7 @@ export default {
         ];
 
         const resultMap = await settleAllPromises(promiseResultMap);
-        const glassParts = [...store.getters.order.lineItems.glassParts];
+        const glassParts = store.getters.order.lineItems.glassParts ?? [];
         const availableLineItems = [
             resultMap.rainDefense,
             ...resultMap.supportingItems,