facebook-sdk-for-unity 🚀 - Crash on launch on iOS - [FBSDKGraphRequestConnection errorFromResult:request:]

I'm getting this exact issue every time I launch on my iPhone 6s. It was not happening with the 7.14.1 version of the SDK, only 7.15.0. It means I'm completely unable to test my game without going back to an older version of the SDK (which I didn't seem to be getting any events from - hence why I upgraded). Would also love feedback if anyone else knows what might be wrong!

From Xcode the error appears to be: NSInvalidArgumentException: +[NSError fbErrorWithCode:userInfo:message:underlyingError:]: unrecognized selector sent to class 0x257dd4f80

BlazingGillian on 3 Jan 2019

Any news on this? We're getting the crash even without calling the API at all, just having it as part of the project. We have to remove the sdk completely for now...

NumaNumaNuma on 7 Jan 2019

I'm not sure if it'll be helpful but it turns out my problem was caused by the FacebookSettings object breaking when I updated the SDK. I just deleted it and made a new one and now everything is working again.

BlazingGillian on 8 Jan 2019

Hey @NumaNumaNuma @BlazingGillian, FB Unity SDK v7.15.1 is released and the issue should be fixed.

KylinChang on 11 Jan 2019

Hi @KylinChang, unfortunately I updated to the latest version and the issue is still occurring, the app crashes on launch every time. (It was also happening with 7.14.1 by the way).

NumaNumaNuma on 18 Jan 2019

Hi @NumaNumaNuma , thanks for your report. Can you provide more details about the iOS device you use, iOS version and maybe more stack traces?

KylinChang on 19 Jan 2019

I've seen it happen on a mix of iPhones and iPads running iOS 11.4, 12 and 12.1, so I'm not sure if it's device related (iPad Pro 11" 2018, iPhone X, iPhone XR, iPhone XS Max). The one interesting thing is for the people affected it works fine on wifi, but crashes 99% of the time on cellular. As for stack traces, I don't have anything besides the crash logs reported by xcode (hundreds of the same crash log). Could I email the .xccrashpoint file to you?

NumaNumaNuma on 19 Jan 2019

@NumaNumaNuma , sure, you can email .xccrashpoint file to me. Thanks for your report again!

KylinChang on 19 Jan 2019

@KylinChang Thanks, sent.

NumaNumaNuma on 19 Jan 2019

I tried using the sdk example scene AppEvents as a test, to rule out anything being caused by my project, and it 's crashing too. I didn't add anything to the scene besides this script to initialise the sdk that I placed on a gameobject in the scene (the example scene didn't have any init code by default). One thing I noticed is I'm getting a warning for calling init twice (in Awake and in OnApplicationPause), not sure if that's a problem?

`
public class AnalyticsManager: MonoBehaviour
{

    void Awake()
    {
        base.Awake();
        InitFBSDK();
    }

    public void InitFBSDK()
    {
        if (!FB.IsInitialized)
        {
            // Initialize the Facebook SDK
            FB.Init(InitCallback);
        }
        else
        {
            // Already initialized, signal an app activation App Event
            FB.ActivateApp();
        }
    }

    public void InitCallback()
    {
        if (FB.IsInitialized)
        {
            // Signal an app activation App Event
            FB.ActivateApp();
        }
        else
        {
            Debug.Log("Failed to Initialize the Analytics SDK");
        }
    }

    private void OnApplicationPause(bool pauseStatus)
    {
        // Check the pauseStatus to see if we are in the foreground
        // or background
        if (!pauseStatus)
        {
            //app resume
            if (FB.IsInitialized)
            {
                FB.ActivateApp();
            }
            else
            {
                //Handle FB.Init
                FB.Init(InitCallback);
            }
        }
    }

}`

NumaNumaNuma on 20 Jan 2019

We're seeing the same issue, except for our users it seems disabling wifi and going over 4G works. Maybe it's just something with a change of network connection that temporarily fixes it?

kuljaninemir on 22 Jan 2019

I think whichever is the fastest/slowest is causing problems at init time. Hopefully Kylin finds something in my logs🤞.

NumaNumaNuma on 22 Jan 2019

👍1

@KylinChang Let me know if you want our crash logs as well.

kuljaninemir on 22 Jan 2019

Hi @NumaNumaNuma @kuljaninemir , I think you can add -ObjC flag in exported xcode project to fix the problem. I will keep this issue open and please let me know if it still crashes with the flag. FYI, here is link about how to add the flag http://docs.onemobilesdk.aol.com/ios-ad-sdk/adding-objc-linker-flag-xcode.html

KylinChang on 23 Jan 2019

@KylinChang Thanks, I tried adding the flag, but it causes a link error:
/Libraries/Plugins/iOS/libQuantumCore.a(QuantumCore.o)' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. file '/Libraries/Plugins/iOS/libQuantumCore.a' for architecture arm64
I could disable bitcode but I'd rather not. Is there any way around this?
edit: I'll disable bitcode and send to my patient 0, see if the issue is resolved.

NumaNumaNuma on 23 Jan 2019

👍2

All is good on my side and users reported the problem is gone. I'll put a version out to the world and if no one complains then we can call it fixed! @kuljaninemir is it fixed for you too?

NumaNumaNuma on 24 Jan 2019

I don't have contact with a patient 0 unfortunately so I'll have to push an update with this and see if the crashes stop.

kuljaninemir on 24 Jan 2019

No crashes so far, I think it's fixed! Thanks @KylinChang

NumaNumaNuma on 31 Jan 2019

🎉1

Seems to work for us as well, thanks @KylinChang

kuljaninemir on 31 Jan 2019

🎉1

I have the same issue with my app. Version 7.15.1
Will try to upload next version with -ObjC flag. Sorry, maybe this is stupid question, but why this information is not in instruction with sdk integration?

Gornian on 15 Mar 2019

Why not just add a post processing script to the Unity SDK?

[PostProcessBuild]
public static void OnPostprocessBuild(BuildTarget buildTarget, string path)
{
    if (buildTarget == BuildTarget.iOS)
    {
        string projPath = PBXProject.GetPBXProjectPath(path);

        PBXProject proj = new PBXProject();
        proj.ReadFromString(File.ReadAllText(projPath));
        string targetName = PBXProject.GetUnityTargetName();
        string targetGUID = proj.TargetGuidByName(targetName);

        proj.AddBuildProperty(targetGUID, "OTHER_LDFLAGS", "-ObjC");

        File.WriteAllText(projPath, proj.WriteToString());
    }
}

GabrielCoriiu on 16 Mar 2019

👍3 ❤1

Yes please, That's what I ended up doing, but for others please add it to the post build process.

NumaNumaNuma on 16 Mar 2019

👍1

I am encountering the exact same issue.
What you mentioned here of adding the -ObjC did the trick for iPhone, but Apple rejected my binaries because of a crash on an iPad with IOS 12.1.4.
Can anyone shed light on this please? I can't figure that out.
The moment I go on cellular / flight mode / remove the Facebook SDK the error is gone.
On Android everything works perfectly.

sharonreytan on 25 Mar 2019

@sharonreytan Did you try the solution mentioned above?
Are you using any other analytics solutions?

oct-test on 26 Mar 2019

Yes, I added the -ObjC flag. It did solved the issue on my iPhone with IOS 12.1.4 that I test with, but Apple rejected my app, saying that it crashes on load on an iPad with IOS 12.1.4, on wifi.
I use Game Analytics SDK in addition to Facebook SDK.
The error comes from the Facebook SDK for sure, it is the one that throws the exception that crashes my app. Also, when I remove it everything works well, no crashes.
I use Unity 2018.3.3, Facebook SDK 7.15.1 and xcode 10.1.
The error happens only when the wifi is connected, with that flag, it happens on iPads but not on iPhones. it is not something in my code.