NullReferenceException on cold starts without attribution [iOS] [Adjust v5.1.2]

[AndrewUrbanovich]

Hi! We are facing NullRef exception during cold app starts without any attribution present.

NullReferenceException: Object reference not set to an instance of an object.
AdjustSdk.JSONNode.Parse (System.String aJSON) (at <00000000000000000000000000000000>:0)
AdjustSdk.AdjustAttribution..ctor (System.String jsonString) (at <00000000000000000000000000000000>:0)
AdjustSdk.AdjustiOS+<>c__DisplayClass111_0.<AttributionGetterMonoPInvoke>b__0 () (at <00000000000000000000000000000000>:0)
AdjustThreadDispatcher.Update () (at <00000000000000000000000000000000>:0)

Adjust: 5.1.2
Platform: iOS (probably same behavior for Android)
XCode: 15.4
Unity: 2022.3.52f

[uerceg]

Hey @AndrewUrbanovich,

Thanks for reporting this. Are you getting this when you are trying to initialize SDK during the InitSdk call or at some other moment?

[AndrewUrbanovich]

@uerceg I suppose it's on GetAttribution call right after InitSdk

Adjust.InitSdk(adjustConfig);
Adjust.GetAttribution(AttributionChangedHandler);

[uerceg]

Thank you. And is this always reproducible on your end?

[AndrewUrbanovich]

@uerceg yesterday it was happening on every launch, but now I can't reproduce this.
Maybe it was happening because it couldn't find an attribution for some reason, NullRef should happen if attribution string is null because there are no null checks during JSON parsing.
But I'm not sure how to make it happen again.

[AndrewUrbanovich]

Here is some additional information, maybe you can check some information on your end and see what's happened:
idfa: 02662947-4141-4245-9C2B-4C3CB80EB508
Time: 11.03.2025 16:00:45 CEST

[AndrewUrbanovich]

@uerceg Hi! Did you manage to detect the issue? Any news on estimation?

[AndrewUrbanovich]

We managed to find 100% reproduction steps:

1. Install app with Adjust v5.0.6
2. Launch the app with normal internet connection
3. Update the app to new version with Adjust v5.1.2
4. Turn on 100% loss in developer option, network link conditioner
5. Launch the app

And getting error mentioned above

[AndrewUrbanovich]

After we added few additional null-checks for jsonString and jsonResponseString there is no error

But we're not getting attributionChanged callback anymore (same steps - during update from previous version to a new one) and this is issue for us, we are subscribing in two ways:

AttributionChangedDelegate = AttributionChangedHandler inside AdjustConfig

And

Adjust.InitSdk(adjustConfig);
Adjust.GetAttribution(AttributionChangedHandler);

[uerceg]

Thank you for all the checks and report. We'll address this next week. I'll keep you posted.

[uerceg]

Hey @AndrewUrbanovich,

Thank you one more time for all the effort on this one from your end. We have just shipped v5.1.3 with this fix. Looking forward to hearing back from you if this version fixed this issue for you or are you maybe still facing it.