NHibernate QueryOver with subquery using parent (root) alias = could not resolve property exception

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Also asked at stackoverflow site: http://stackoverflow.com/questions/39493202/nhibernate-queryover-with-subquery-using-parent-root-alias-could-not-resolve

I'm trying to write QueryOver with subquery, which references root query property inside it using this code:

Entity root = null;
var query = Session.QueryOver(() => root);
var subQuery = QueryOver.Of<Entity>();
subQuery.Where((x) => x.Id == root.Id).Select(Projections.RowCount());
query.WithSubquery.WhereValue(0).Eq(subQuery);
query.List();

This doesn't work, because: NHibernate.QueryException: could not resolve property: root of: Entity

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I Figured this out. The exception mensioned, is caught inside NH, and it doesn't break the query. I was debuging code in Visual Studio with enabled "stop on thrown exception" option. And thought I had "only my code" option switched on, for some strange reason exception from NH are shown. My collegue pointed out that line of code with caught exceptions is highlighted in green, and uncaught are yellow.