Subscription Contract delivery method returns null

[d_tehrani]

Hi.

Sometimes a subscription contract's delivery method becomes null even if I enter the address during the checkout process.

{
    "data": {
        "subscriptionContract": {
            "__typename": "SubscriptionContract",
            "status": "ACTIVE",
            "deliveryMethod": null
        }
    },
    "loading": false,
    "networkStatus": 7
}

Does anyone know why this happens or know how to fix it?