In SQL Mgmt Studio open the store proc "Smith_SA_ListCustomers" and add the dnnlogin field as highlighted below:
ALTER PROCEDURE [dbo].[dnn_Smith_SA_ListCustomers]
@PortalId int
AS
select distinct c.customerid,c.firstname,c.lastname,c.email,c.Address1,c.address2,c.City,c.state,c.country,c.companyname,c.zip,c.homephone,
c.workphone,c.dnnlogin,
o.orderdate,o.status,o.trackingnumber,convert(varchar,o.taxtotal) as taxtotal,o.affiliateid,o.surcharge,o.shipmethod,
o.orderid,convert(varchar,o.shippingtotal) as shippingtotal,convert(varchar,o.handlingcharge) as handlingcharge,o.specialinstructions,
coup.couponcode,convert(varchar,o.discount) as discount, ph.billingaddress,ph.billingzip,ph.acctno,ph.exproute,convert(varchar,ph.amount) as amount,
ph.payhistid,ph.authcode,ph.notes,ph.status as paystatus,ph.billingname,ph.billingcity,ph.billingstate,ph.billingcountry, ph.transid,
o.ShipDate,o.shipaddress2
from dnn_smith_storeorders o
join dnn_smith_customer c on
o.customerid = c.customerid
left outer join dnn_smith_payhist ph on
o.payhistid = ph.payhistid
left outer join dnn_smith_coupons coup on
o.couponid = coup.couponid
where o.portalid = @PortalId
order by o.orderid desc
Then click run to update the store proc and it will fix the issue. This fix will be be realeased in cart v4.26 shortly.