Nhibernate 2nd level cache and Result transformer

I have a big problem with 2nd level cache in NHibernate. Everything is working fine(Cache is running well) until I use

.SetResultTransformer(new DistinctRootEntityResultTransformer())

Example code:

using (var session = SessionFactory.OpenSession())
{
Console.WriteLine("---> using query first time");
var query = session
.CreateQuery("from Blog b where b.Author = :author")
.SetString("author", "Gabriel")
.SetCacheable(true)
.SetResultTransformer(new DistinctRootEntityResultTransformer())
;
var list = query.List<Blog>();
}

Exception:

NHibernate.PropertyAccessException: Exception occurred getter of Caching.Blog.Id
v NHibernate.Properties.BasicPropertyAccessor.BasicGetter.Get(Object target) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Properties\BasicPropertyAccessor.cs: line 211
v NHibernate.Tuple.Entity.AbstractEntityTuplizer.GetIdentifier(Object entity) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Tuple\Entity\AbstractEntityTuplizer.cs: line 139
v NHibernate.Persister.Entity.AbstractEntityPersister.GetIdentifier(Object obj, EntityMode entityMode) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs: line 3883
v NHibernate.Persister.Entity.AbstractEntityPersister.IsTransient(Object entity, ISessionImplementor session) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs: line 3669
v NHibernate.Engine.ForeignKeys.IsTransient(String entityName, Object entity, Nullable`1 assumed, ISessionImplementor session) v ForeignKeys.cs: line 194
v NHibernate.Engine.ForeignKeys.GetEntityIdentifierIfNotUnsaved(String entityName, Object entity, ISessionImplementor session) v ForeignKeys.cs: line 250
v NHibernate.Type.ManyToOneType.Disassemble(Object value, ISessionImplementor session, Object owner) v ManyToOneType.cs: line 137
v NHibernate.Cache.StandardQueryCache.Put(QueryKey key, ICacheAssembler[] returnTypes, IList result, Boolean isNaturalKeyLookup, ISessionImplementor session) v StandardQueryCache.cs: line 82
v NHibernate.Loader.Loader.PutResultInQueryCache(ISessionImplementor session, QueryParameters queryParameters, IType[] resultTypes, IQueryCache queryCache, QueryKey key, IList result) v Loader.cs: line 1668
v NHibernate.Loader.Loader.ListUsingQueryCache(ISessionImplementor session, QueryParameters queryParameters, ISet`1 querySpaces, IType[] resultTypes) v Loader.cs: line 1617
v NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet`1 querySpaces, IType[] resultTypes) v Loader.cs: line 1591
v NHibernate.Hql.Ast.ANTLR.Loader.QueryLoader.List(ISessionImplementor session, QueryParameters queryParameters) v QueryLoader.cs: line 300
v NHibernate.Hql.Ast.ANTLR.QueryTranslatorImpl.List(ISessionImplementor session, QueryParameters queryParameters) v QueryTranslatorImpl.cs: line 111
v NHibernate.Engine.Query.HQLQueryPlan.PerformList(QueryParameters queryParameters, ISessionImplementor session, IList results) v HQLQueryPlan.cs: line 105
v NHibernate.Impl.SessionImpl.List(String query, QueryParameters queryParameters, IList results) v SessionImpl.cs: line 616
v NHibernate.Impl.SessionImpl.List<T>(String query, QueryParameters parameters) v SessionImpl.cs: line 592
v NHibernate.Impl.QueryImpl.List<T>() v QueryImpl.cs: line 94
v UnitTests.when_having_blog_with_posts.trying_to_cache_a_complex_query() v Blog_Spec.cs: line 110

Mapping:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
namespace="Caching"
assembly="Caching">
<class name="Blog">
<cache usage="read-write"/>
<id name="Id">
<generator class="hilo"/>
</id>
<property name="Author"/>
<property name="Name"/>
<set name="Posts" cascade="all" lazy="true">
<cache usage="read-write"/>
<key column="BlogId"/>
<one-to-many class="Post"/>
</set>
</class>

<class name="Post">
<cache usage="read-write"/>
<id name="Id">
<generator class="hilo"/>
</id>
<property name="Title"/>
<property name="Body"/>
</class>

</hibernate-mapping>

Classes:

public class Blog
{
public virtual int Id { get; set; }
public virtual string Author { get; set; }
public virtual string Name { get; set; }
public virtual ISet<Post> Posts { get; set; }

public Blog()
{
Posts = new HashedSet<Post>();
}
}

public class Post
{
public virtual int Id { get; private set; }
public virtual string Title { get; set; }
public virtual string Body { get; set; }
}

nhibernate.config:

<property name="cache.provider_class">NHibernate.Cache.HashtableCacheProvider</property>
<property name="cache.use_second_level_cache">true</property>
<property name="cache.use_query_cache" >true</property>

In summary: Cache and nhibernate running well until i use result transformer. To work i must disable transformer or 2nd level cache. It is not working together

This is only example, i know that distinct in this situation is stupid.