Sync error for upload from Android `{"errorType":"RuntimeException"}` in `pushLocalChanges()`

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

1. Change a note via the Android app, then a sync error comes up. Syncing from Cloud to Android device works.

Expected behavior

Changing notes should automatically sync without errors

Notes Android version

4.3.1

Notes server version

4.10.1

Nextcloud Android version

3.29.2

Nextcloud version

29.0.8

Device

Samsung Galaxy A40

Android Version

11

App Store

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

Stacktrace

App Version: 4.3.1
App Version Code: 40030192
App Flavor: play

Files App Version Code: 30290290 (PROD)

---

OS Version: 4.4.177-25902526(A405FNXXU4CWC3)
OS API Level: 30
Device: a40
Manufacturer: samsung
Model (and Product): SM-A405FN (a40eea)

---

java.lang.Exception: {"errorType":"RuntimeException"}

	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:151)
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:100)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:923)


java.lang.Exception: {"errorType":"RuntimeException"}

	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:164)
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:100)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:923)

Start in NotesServerSyncTask.java at pushLocalChanges(), especially lines 151 and 164, then trace how run() invokes it. Reproduce the local note change and sync failure described in the issue, and compare the failing upload path with the working Cloud-to-device sync; done means local changes sync without the RuntimeException.