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NHibernate Linq does not support `Object.Equals`

I am trying to run the following LINQ query, with NHibernate 4.0.4.4000:

user = await Task.Run(() => Session.Query<TUser>().Where(u => u.Id.Equals(id)).FirstOrDefault()).WithCurrentCulture();

and I get the following error:

 System.NotSupportedException: Boolean Equals(System.String)

I cannot use == because Id is TKey typical parameter of type TKey , and C # does not allow me to do this. I looked at it, and NHibernate said it was fixed in NH3.0.0GA . Surely, in 4.0.4 it would not be detached again? Maybe because I run it in Task ? Is there a workaround other than ToList and then use Equals ?

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