NULL Value eliminated in aggregate function

Hi Experts!
I was hoping someone could be abel to assist me with an SQL query for my Sybase database.

The query below gives me the warning
NULL Value eliminated in aggregate function

It seams like the query gives me correct result, but I cannot live with the warning

select
count(case when Programs.Level=1 then 1 else NULL end) as Level1,
count(case when Programs.Level=2 then 1 else NULL end) as Level2
from Programs key join Customers key join ProgramHead
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