@@ -48,7 +48,7 @@ class UserPlanDetailSerializer(serializers.Serializer):
     uid = serializers.UUIDField()
     plan = PaymentPlanSerializer()
     last_payment_at = serializers.DateField()
-    next_payment_at = serializers.DateField()
+    next_payment_at = serializers.DateTimeField(allow_null=True)
     current_token_balance = serializers.IntegerField()