NullPointerException after updating app with msal from 1.4.0 to 1.5.1 and enabled proguard

NullPointerException: Attempt to invoke virtual method ‘java.lang.String com.microsoft.identity.common.internal.dto.AccountRecord.getHomeAccountId()’ on a null object reference

Smartphone

• Pixel 3 Xl, android 10, WEB VIEW, msal 1.5.1, obfuscation is ON

Stacktrace

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: PID: 22613
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.microsoft.identity.common.internal.dto.AccountRecord.getHomeAccountId()' on a null object reference
        at com.microsoft.identity.client.AccountAdapter$HomeAccountFilter.filter(AccountAdapter.java:82)
        at com.microsoft.identity.client.AccountAdapter.filterCacheRecords(AccountAdapter.java:351)
        at com.microsoft.identity.client.AccountAdapter.adapt(AccountAdapter.java:153)
        at com.microsoft.identity.client.SingleAccountPublicClientApplication.getAccountFromICacheRecordList(SingleAccountPublicClientApplication.java:515)
        at com.microsoft.identity.client.SingleAccountPublicClientApplication.getPersistedCurrentAccount(SingleAccountPublicClientApplication.java:479)
        at com.microsoft.identity.client.SingleAccountPublicClientApplication.acquireTokenSilentAsync(SingleAccountPublicClientApplication.java:603)
        at x.a.a.e.q.a$h$a.a(AuthorizationRepository.kt:56)
        at x.a.a.e.q.a$h$a.accept(AuthorizationRepository.kt:29)
        at m.b.i0.d.f.a(ConsumerSingleObserver.java:62)
        at m.b.i0.e.f.m$a.a(SingleDoOnSuccess.java:60)
        at m.b.i0.e.f.b$a.a(SingleCreate.java:67)
        at x.a.a.e.k.a$a$a.onCreated(AzureB2CConfig.kt:44)
        at com.microsoft.identity.client.PublicClientApplication$11.onCreated(PublicClientApplication.java:978)
        at com.microsoft.identity.client.PublicClientApplication$9.onTaskCompleted(PublicClientApplication.java:906)
        at com.microsoft.identity.client.PublicClientApplication$9.onTaskCompleted(PublicClientApplication.java:894)
        at com.microsoft.identity.common.internal.controllers.CommandDispatcher$3.run(CommandDispatcher.java:212)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

To Reproduce

1. Login into app with msal 1.4.0 (Single mode, webview)
2. Update msal to 1.5.1
3. Install app update
4. run acquireTokenSilentAsync for loginApplication

Expected behavior No crash, success in acquireTokenSilentAsync

Actual Behavior App crashed

Additional context Does not repro on debug build without obfuscation

[azakharenka1]

@kreedula any updates with it? We could catch this exception and manually logout this user but i don’t really like those solution and don’t want to do it)

[tanmaymanolkar1]

@azakharenka1 I believe you may have found a documentation gap for us. Thank you for that, we will work to correct it and apologies for the inconvenience caused.

The possible reason you may be facing this problem is because B2C registered applications need to be used in conjunction with MultipleAccountPublicClientApplication and not SingleAccountPublicClientApplication.

Attaching the link to the resource for implementation details.

https://docs.microsoft.com/en-us/azure/active-directory/develop/single-multi-account#multiple-account-public-client-application

Please let us know if you encounter similar errors after doing the mentioned fix.