Interaction is null

Question

When a user submits's a form on the contact us page, I am creating a contact in xDB as:

try
{
    //Identify the user
    Tracker.Current.Session.Identify(model.Email);

    //Get the contact
    var contact = Tracker.Current.Session.Contact;

    if (contact != null)
    {
        //Update contact
        SitecoreContactManager.UpdateXdbContact(model.Email, model.FirstName, model.LastName, model.Phone);
    }
    else
    {
        //Create contact
        Tracker.Current.Session.Contact = SitecoreContactManager.GetXdbContact(model.Email);
    }
}
catch (Exception exception)
{
    Sitecore.Diagnostics.Log.Error($"error in creating or updating contact for identifier {model.Email}", exception, this);
}

this works well locally and on DEV but in live, it is throwing an error as :

Exception: System.InvalidOperationException Message: this.Interaction should not be null Source: Sitecore.Analytics at Sitecore.Analytics.Tracking.StandardSession.Identify(String userName) at uk.co.biggroup.www.api.ContactFormController.CreateUpdateContactInXdb(FormDetailsModel model)

• I have checked the connections to mongo databases(I can see data in there)
• I have rebuild reporting database.
• compared the Sitecore /admin/showconfig.aspx of DEV and LIVE, I could not able to see anything obvious.

Sitecore version: 8.2 rev. 170614 (Update-4)

Did anyone experience this issue before?

Answer 1

It mostly seems related to Null Session. If you have multiple CD servers, you should have shared session. Since you are using MongoDb, here is an article from Sitecore to configure Shared session with MongoDb provider. I would suggest to make changes on Live according to this and then check. It is not needed locally as we don't have multiple CDs there.

Shared session with MongoDb provider

• You need a shared session database.
• Then configure it on CD server to use it.
• Also, if you are creating any custom object to store in session, do create is as serializable.