NullReferenceException in AdDuplex

We recently switched over to AdDuplex in our trial apps to get some extra promotion, as using the Microsoft PubCenter.

Last night, while waiting around, I started playing with one of them, and found that the app would crash, with the following call stack when connected to BTOpenZone, but not logged in.

System.NullReferenceException
Object reference not set to an instance of an object.
   at AdDuplex.AdControl.OnNetworkManagerAdLoaded(Object sender, AdLoadedEventArgs e)
   at AdDuplex.Models.NetworkManager.OnAdLoaded(TextAdInfo newAd)
   at AdDuplex.Models.NetworkManager.<>c__DisplayClass2.<LoadNewAdCallback>b__0()

I vaguely remembered seeing an update to the AdDuplexW8 nuget package midway through my updates that said that it fixed a null reference problem.

Obviously, this was it.

So, if you’re not using AdDuplex.WindowsPhone version 2.8.0.4 or later, you’ll need to rebuild your apps and resubmit, or else your app too will crash.