It will be null in VFP9 with SET ENGINEBEHAVIOR 90

>Given a sequence like this

>select sum(apr) from crsRpt where fisyear = fy into array a1
>replace aprTotal with nvl(a1,0)
>select sum(may) from crsRpt where fisyear = fy into array a1
>replace mayTotal with nvl(a1,0)
>select sum(jun) from crsRpt where fisyear = fy into array a1
>replace junTotal with nvl(a1,0)

>you would think that if the select came up empty the array a1 would become null. However I find that instead of being reset to null the array simply carries over with its prior value. Is there a way to insure that it will be null if the select is empty?
>
>Thanks