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Editorial Team
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Editorial Team
Asked: June 5, 20262026-06-05T18:22:37+00:00 2026-06-05T18:22:37+00:00

I have a query by linq to NHibernate. var q = SessionInstance.Query<Request>().Max(e => e.Code);

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I have a query by linq to NHibernate.

var q = SessionInstance.Query<Request>().Max(e => e.Code);

If Request table has no rows, execution of this query raises GenericADOException with this message :

{"Could not execute query[SQL: SQL not available]"}

{"Value cannot be null.\r\nParameter name: item"}

What should I do?

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  1. Editorial Team
    Editorial Team
    2026-06-05T18:22:38+00:00Added an answer on June 5, 2026 at 6:22 pm

    Try this

    SessionInstance.Query<Request>().Max(x => (int?)x.Code);
    
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