Getting the previous photo

gistfile1.cs

// When I run this code when no previous photo should be found, I get
// an exception saying "Query returned multiple rows; cannot return
// scalar value.". This is strange because it shouldn't return _any_
// values and because I use ".Take(1)" to make sure only one row is
// returned.

string previousSlug = DB.Photos
                        .Query()
                        .Select(DB.Photos.Slug)
                        .Where(DB.Photos.Published == true && DB.Photos.DatePublished < photo.DatePublished.Value) // There is no published photo with a smaller DatePublished than the one I check against
                        .OrderByDatePublishedDescending()
                        .Take(1) // Should return only one record no matter what
                        .ToScalarOrDefault<string>();