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NHibernate–PostgreSQL - Dialect does not support DbType.Guid Parameter name: typecode

When trying to create a new ISession instance, NHibernate throwed the following error message:

Dialect does not support DbType.Guid Parameter name: typecode

at NHibernate.Dialect.TypeNames.Get(DbType typecode)
at NHibernate.Mapping.Table.SqlTemporaryTableCreateString(Dialect dialect, IMapping mapping)
at NHibernate.Mapping.PersistentClass.PrepareTemporaryTables(IMapping mapping, Dialect dialect)
at NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, IMapping mapping, Settings settings, EventListeners listeners)
at NHibernate.Cfg.Configuration.BuildSessionFactory()
at FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory()

As you can probably guess from the title, we are using PostgreSQL and it turns out that the default used Dialect doesn’t support Guids. Luckily this was fixed a long time ago and the only thing I had to do was specify explicitly a higher Dialect version:

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