diff --git a/src/layouts/payment-method/payment-method.vue b/src/layouts/payment-method/payment-method.vue
index c8ef38b3e..41de977b6 100644
--- a/src/layouts/payment-method/payment-method.vue
+++ b/src/layouts/payment-method/payment-method.vue
@@ -201,6 +201,7 @@ export default {
             taxedVaps,
             lineItems
         );
+        lineItems.vaps = lineItems.vaps ?? [];
         lineItems.vaps.push(...vapsToAddToCart);
 
         // Call the "next" function to complete the transition to this page.