Postgres SQL: Query doesn't return data with ANY() clause when array is empty

There is postgres sql query, shown below:

Select agencyId, SUM(open),
   from agencies 
   where agency_id= 100 and agency_platform = any(@platformIds) 
   GROUP BY agencyId;

If platformIds list is empty then this query doesn't return any data, and on the other hand below query data with no issues:

Select agencyId, SUM(open), 
    from agencies 
    where agency_id= 100 
    GROUP BY agencyId;

any thoughts?