Notes throws error upon first configuration if ShareAPI is disabled

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

I have recently bought a new phone and I am setting up like my old one. I had Nextcloud and Notes working on my old phone. However, when setting up Notes on my new phone, I get an error.

1. Install Nextcloud App
2. Set up Account on Nextcloud App
3. Install Notes App
4. Open App
5. Klick "Select Account"
6. Select Account
7. Klick "OK"
8. Allow account access
9. Error message

Expected behavior

Notes from Nextcloud instances get loaded. This has worked with the same Notes/Nextcloud/App version combination on my old phone previously.

Notes Android version

4.4.2

Notes server version

4.12.3

Nextcloud Android version

3.32.3

Nextcloud version

31.0.8

Device

Google Pixel 10 Pro

Android Version

16

App Store

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

Stacktrace

App Version: 4.4.2
App Version Code: 40040290
App Flavor: fdroid

Files App Version Code: 30320390 (PROD)

---

OS Version: 6.6.82-android15-8-gd4aed7ed470e-ab13759939-4k(13955164)
OS API Level: 36
Device: blazer
Manufacturer: Google
Model (and Product): Pixel 10 Pro (blazer)

---

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.gson.JsonPrimitive com.google.gson.JsonObject.getAsJsonPrimitive(java.lang.String)' on a null object reference
	at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:75)
	at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:32)
	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:95)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:561)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:519)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:561)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:519)
	at com.google.gson.Gson.fromJson(Gson.java:1359)
	at com.google.gson.Gson.fromJson(Gson.java:1260)
	at com.google.gson.Gson.fromJson(Gson.java:1228)
	at com.nextcloud.android.sso.api.NextcloudAPI.convertStreamToTargetEntity(NextcloudAPI.java:136)
	at com.nextcloud.android.sso.api.NextcloudAPI.lambda$performRequestObservableV2$0(NextcloudAPI.java:98)
	at com.nextcloud.android.sso.api.NextcloudAPI.$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.CapabilitiesClient.getCapabilities(CapabilitiesClient.java:38)
	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.lambda$onActivityResult$5(ImportAccountActivity.java:103)
	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.$r8$lambda$wIJzzcgrzM9d6k7exwdLMn3GvgQ(Unknown Source:0)
	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity$$ExternalSyntheticLambda4.run(D8$$SyntheticClass:0)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:524)
	at java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1156)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
	at 

java.lang.Thread.run(Thread.java:1119)

Start with CapabilitiesDeserializer.java at line 75, then trace how CapabilitiesClient.getCapabilities and ImportAccountActivity.onActivityResult handle the response. Reproduce the account setup with ShareAPI disabled and inspect the capabilities payload. Done means selecting an account completes without the NullPointerException and the Notes from the instance load.