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K-9 fails to import settings and then crashes

See original GitHub issue

Checklist

I have used the search function to see if someone else has already submitted the same bug report.
I will describe the problem with as much detail as possible.

App version

5.914 (git 0e78b8aae6bda14aca094298813b50759b50e8cb)

Where did you get the app from?

Built from source

Android version

API level 29

Device model

Emulator

Steps to reproduce

Export settings and immediately re-import. You get a toast “import failed”. Clearing the app data and trying to import the settings file also fails.

There is nothing particularly interesting about the settings, it’s a standard IMAP/SMTP setup. The emulator is a bit slow due to RAM constraints so I’m wondering if there is a race when writing the newly created accounts to storage.

Expected behavior

K-9 should import the settings

Actual behavior

K-9 fails to import the settings with an error message. If you keep trying to import, K-9 completely crashes.

Logs

logcat says

2022-04-04 16:32:55.897 7076-7076/com.fsck.k9.debug E/SettingsImportViewModel$startImportSettings: Error importing settings
    com.fsck.k9.preferences.SettingsImportExportException: java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter account
        at com.fsck.k9.preferences.SettingsImporter.importSettings(SettingsImporter.java:298)
        at com.fsck.k9.ui.settings.import.SettingsImportViewModel.importSettings(SettingsImportViewModel.kt:363)
        at com.fsck.k9.ui.settings.import.SettingsImportViewModel.access$importSettings(SettingsImportViewModel.kt:28)
        at com.fsck.k9.ui.settings.import.SettingsImportViewModel$startImportSettings$1$1$1.invokeSuspend(SettingsImportViewModel.kt:282)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:39)
        at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
     Caused by: java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter account
        at com.fsck.k9.mailstore.SpecialLocalFoldersCreator.createSpecialLocalFolders(Unknown Source:2)
        at com.fsck.k9.preferences.SettingsImporter.importSettings(SettingsImporter.java:287)
        at com.fsck.k9.ui.settings.import.SettingsImportViewModel.importSettings(SettingsImportViewModel.kt:363) 
        at com.fsck.k9.ui.settings.import.SettingsImportViewModel.access$importSettings(SettingsImportViewModel.kt:28) 
        at com.fsck.k9.ui.settings.import.SettingsImportViewModel$startImportSettings$1$1$1.invokeSuspend(SettingsImportViewModel.kt:282) 
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) 
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106) 
        at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:39) 
        at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)