Synchronization failed due to attempting to invoke virtual method on a null object

This issue respects the following points:

• I have read the FAQ
• I have searched for existing issues
• The issue affects the Notes Android app, neither the Notes server app nor the Nextcloud Android app.

Describe the bug

On one of my devices I can't synchronize the notes due to an error.

Expected behavior

No synchronization

Notes Android version

33.1.0

Notes server version

5.0

Nextcloud Android version

33.1.1

Nextcloud version

33.0.3

Device

Samsung Galaxy Tab A

Android Version

8.1

App Store

• Google Play Store
• F-Droid
• Huawei App Gallery

Stacktrace

App Version: 33.1.0
App Version Code: 330010090
App Flavor: play

Files App Version Code: 30340190 (PROD)

---

OS Version: 3.18.14-15260192(T580XXS5CTK1)
OS API Level: 27
Device: gtaxlwifi
Manufacturer: samsung
Model (and Product): SM-T580 (gtaxlwifixx)

---

java.lang.Exception: Attempt to invoke virtual method 'java.lang.String android.content.Context.getString(int)' on a null object reference[com.nextcloud.android.sso.api.AidlNetworkRequest.waitForApi(AidlNetworkRequest.java:153), com.nextcloud.android.sso.api.AidlNetworkRequest.performAidlNetworkRequestV2(AidlNetworkRequest.java:208), com.nextcloud.android.sso.api.AidlNetworkRequest.performNetworkRequestV2(AidlNetworkRequest.java:171), com.nextcloud.android.sso.api.NextcloudAPI.performNetworkRequestV2(NextcloudAPI.java:159), com.nextcloud.android.sso.helper.Retrofit2Helper$1.execute(Retrofit2Helper.java:53), it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:130), it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:99), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636), java.lang.Thread.run(Thread.java:764)]
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:150)
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:99)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
	at java.lang.Thread.run(Thread.java:764)


java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getString(int)' on a null object reference
	at com.nextcloud.android.sso.api.AidlNetworkRequest.waitForApi(AidlNetworkRequest.java:153)
	at com.nextcloud.android.sso.api.AidlNetworkRequest.performAidlNetworkRequestV2(AidlNetworkRequest.java:208)
	at com.nextcloud.android.sso.api.AidlNetworkRequest.performNetworkRequestV2(AidlNetworkRequest.java:171)
	at com.nextcloud.android.sso.api.NextcloudAPI.performNetworkRequestV2(NextcloudAPI.java:159)
	at com.nextcloud.android.sso.api.NextcloudAPI.lambda$performRequestObservableV2$0(NextcloudAPI.java:97)
	at com.nextcloud.android.sso.api.NextcloudAPI.$r8$lambda$af7W9mq2B0ZrhVJwZd-ibFp8T3Y(Unknown Source:0)
	at com.nextcloud.android.sso.api.NextcloudAPI$$ExternalSyntheticLambda1.subscribe(D8$$SyntheticClass:0)
	at io.reactivex.internal.operators.observable.ObservableFromPublisher.subscribeActual(ObservableFromPublisher.java:31)
	at io.reactivex.Observable.subscribe(Observable.java:12284)
	at io.reactivex.internal.operators.observable.ObservableSingleMaybe.subscribeActual(ObservableSingleMaybe.java:31)
	at io.reactivex.Maybe.subscribe(Maybe.java:4290)
	at io.reactivex.Maybe.blockingGet(Maybe.java:2320)
	at io.reactivex.Observable.blockingSingle(Observable.java:5381)
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pullRemoteChanges(NotesServerSyncTask.java:229)
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:101)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
	at java.lang.Thread.run(Thread.java:764)

Start with NotesServerSyncTask.java at run (lines 99-101), pushLocalChanges (130 and 150), and pullRemoteChanges (229), then trace the reported calls into AidlNetworkRequest.waitForApi. Reproduce synchronization on the listed Android 8.1 device or an equivalent setup and determine why the context is null. Done means synchronization no longer fails with this exception.