diff --git a/apps/web/process/payments/reactions/common.ts b/apps/web/process/payments/reactions/common.ts
index a9de31d..6101588 100644
--- a/apps/web/process/payments/reactions/common.ts
+++ b/apps/web/process/payments/reactions/common.ts
@@ -290,6 +290,8 @@ export default function reactions({ store }: ProcessContext) {
         if (!changes?.length || changes.length > 1) return;
 
         const [changeIndex] = changes;
+        if (changeIndex < 1) return;
+
         const value = nextPayments[changeIndex];
         const payments = nextPayments.slice(1, -1).map((payment, i) => {
           if (i <= changeIndex - 2) return payment;