Is this DDD Specification a good practice or not?

/// <summary>
/// Represents a specification that checks if a category with the same name for the same user already exists.
/// </summary>
public class IsUniqueCategoryNameSpecification: Specification<Category>
{
    readonly ICategoryUniquenessChecker _categoryUniquenessChecker;

    public IsUniqueCategoryNameSpecification(ICategoryUniquenessChecker categoryUniquenessChecker)
    {
        _categoryUniquenessChecker = categoryUniquenessChecker;
    }

    protected override void ConfigureConditions()
    {
        AddCondition(category =>
        category.Id == Guid.Empty ? _categoryUniquenessChecker.IsUniqueCategoryNameAsync(category.Name, category.UserId).Result
        : _categoryUniquenessChecker.IsUniqueCategoryNameAsync(category.Id, category.Name, category.UserId).Result, "Category name must be unique.");
    }
}