Property Owner is not available for Database

Error message:

Property Owner is not available for Database '[...]'. This property may not exist for this object, or may not be retrievable due to insufficient access rights.  (Microsoft.SqlServer.Smo)

Explanation:

For some reason, the owner of the DB was set to 'UNKNOWN'.

Check it using sp_helpdb:

Solution:

Change the DB owner to a valid login, using sp_changedbowner.

USE DBNAME

GO

sp_changedbowner 'sa'

GO