crash report

Checklist

• I've already searched in existing issues and haven't found a similar problem reported.
• I'm using the latest version of the app
• This error caused the app to crash
• This error is reproducible

Which category best fits this error?

Feed Sync

App version

0.16.1

Reproduction steps

...

Crash report

Version: 0.16.1
Device: motorola moto g54 5G
System: Android 15 (API 35)

Stack trace: 

.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object kotlinx.coroutines.flow.Flow.collect(kotlinx.coroutines.flow.FlowCollector, kotlin.coroutines.Continuation)' on a null object reference
	at kotlinx.coroutines.flow.internal.CombineKt$combineInternal$2$1.invokeSuspend(Combine.kt:45)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:9)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:112)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:8)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:3)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:93)
	Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@3761c4c, Dispatchers.Default]

Start with the Feed Sync path and the stack trace's coroutine Flow combine call; determine which flow is null on Android 15 with version 0.16.1. The issue provides no source file, reproduction steps, or test entry point, so first establish a reproducible sync scenario. Done means the crash no longer occurs and the affected scenario is covered by a regression check.