diff --git a/packages/unlock-js/src/PublicLock/v10/getPurchaseKeysArguments.js b/packages/unlock-js/src/PublicLock/v10/getPurchaseKeysArguments.js
index 827795fd50c..c1f9382aae5 100644
--- a/packages/unlock-js/src/PublicLock/v10/getPurchaseKeysArguments.js
+++ b/packages/unlock-js/src/PublicLock/v10/getPurchaseKeysArguments.js
@@ -80,7 +80,7 @@ export default async function getPurchaseKeysArguments({
     totalAmountToApprove = keyPrices
       .map((keyPrice, i) => {
         if (keyPrice > 0) {
-          const recurringPayment = recurringPayments[i]
+          const recurringPayment = recurringPayments && recurringPayments[i]
           if (!recurringPayment) {
             return keyPrice
           } else if (recurringPayment === Infinity) {