Spaceused property bringing null values

In the below query, some of the entries come as NULL and other databases, it brings the proper size(spaceused) value. This happens with the master_files system table.

I do not face this issue with sysfiles, for the same database.

can you check if this works fine for you?

SELECT DB_NAME(database_id) AS DatabaseName,
ROUND((size - FILEPROPERTY(name,'SpaceUsed'))/128.000,2),
FROM master.sys.master_files

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anushahannaAuthor Commented:
The link works with sys.database_files and It works right as sysfiles.

What is about master_files that we have this NULL issue?
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Microsoft SQL Server 2005

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