diff --git a/src/Entities/Notification/NotificationSubscription.php b/src/Entities/Notification/NotificationSubscription.php
index 924fa3b..d2e3b63 100644
--- a/src/Entities/Notification/NotificationSubscription.php
+++ b/src/Entities/Notification/NotificationSubscription.php
@@ -39,7 +39,7 @@ public function __construct(
         public SubscriptionDiscount|null $discount,
         public CollectionMode $collectionMode,
         public BillingDetails|null $billingDetails,
-        public SubscriptionTimePeriod $currentBillingPeriod,
+        public SubscriptionTimePeriod|null $currentBillingPeriod,
         public TimePeriod $billingCycle,
         public SubscriptionScheduledChange|null $scheduledChange,
         public array $items,