Flushing with enabled filter causes sometimes exceptions in NHibernate when updating collections.

UnfilteredFlushListener.cs

public class UnfilteredFlushListener : DefaultFlushEventListener
{
    protected override void PerformExecutions(IEventSource session)
    {
        var filter = session.GetEnabledFilter("multitenancy");
        session.DisableFilter("multitenancy");
        base.PerformExecutions(session);
        if (filter != null)
            session.EnabledFilters.Add("multitenancy", filter);
    }
}