[Solved] Unity IAP Null Reference Exception showing up in Unity Analytics. Android Build (4.1.2)

Hi,
First off, I apologize if this is a duplicate issue / thread. I'm using Unity 5.6.1f and the updated Unity IAP.
I'm finding this in Unity Analytics... and I have no idea where to start to Fix it.
From Unity Analytics / App Performance:
Message
NullReferenceException: Object reference not set to an instance of an object
Stack trace
UnityIAP.ProcessPurchase (UnityEngine.Purchasing.PurchaseEventArgs e)
UnityEngine.Purchasing.StoreListenerProxy.ProcessPurchase (UnityEngine.Purchasing.PurchaseEventArgs e)
UnityEngine.Purchasing.PurchasingManager.ProcessPurchaseIfNew (UnityEngine.Purchasing.Product product)
UnityEngine.Purchasing.PurchasingManager.OnProductsRetrieved (System.Collections.Generic.List`1 products)
UnityEngine.Purchasing.NativeJSONStore.OnProductsRetrieved (System.String json)
UnityEngine.Purchasing.ScriptingUnityCallback+<OnProductsRetrieved>c__AnonStorey1.<>m__0 ()
UnityEngine.Purchasing.Extension.UnityUtil.Update ()

Please Note: this is with the IAPDemo.cs script, and I have added in the products to both the script and using the catalog manager. I made Purchase buttons, dropped them onto the main canvas in a panel that gets gameObject.SetActive(true); when the store is needed.
The test purchases work 95% of the time; on the rare occasion, it will fail and close my application on my test device. In that instance, the purchase *never* shows up.
The only platform targeted with the build is Android, and Google Play Store. Everything else is commented out.

Thank you for all help with this - I'm trying to get it down (first time using Unity's IAP)

 

@MichiealO

I'm sorry to hear that you are seeing errors in your project.

If you are using the "Codeless IAP" then you will not need to use the IAPDemo.cs script. I would ask that you remove the IAPDemo.cs script from your scene.

In regards to the NullReferenceException:
Can you please double-click the error in the console, this will take you to the line in your code where this happens. Can you share this with me?

 

@BenStoneman Sorry that I didn't see this sooner!!!

I only find this error in the analytics section on the WEB PAGE... I don't ever see it in the Editor. Hence having no clue where to start with it. I deleted the demo script and removed my modified version of the script. It's good to know that you don't have to do both.

And I just went into check, and I am getting told that I do not have access to Unity Analytics, that I need to see the store for purchasing options. I have the pro version (Internal Developer)... But, Even though my app uses the analytics service, and it says that it's free... So, I'm totally confused here. Did something change and I just didn't know that it changed?

 

Also, is there a way to display a receipt using the Codeless IAP? I want my customers to be able to reference transactions, and I want a way to be able to store their transactions so I can reference them.