# Quartz Clock Proxy Unstable for Xbox Development 

**URL:** <https://forums.unrealengine.com/t/quartz-clock-proxy-unstable-for-xbox-development/2633642>\
**Category:** Audio\
**Tags:** audio-bugs, unreal-engine, Xbox, question\
**Created:** [August 7, 2025, 3:55pm UTC](https://forums.unrealengine.com/t/quartz-clock-proxy-unstable-for-xbox-development/2633642 "2025-08-07T15:55:55Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![josharaed](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@josharaed](https://forums.unrealengine.com/u/josharaed)\
**Post date:** [August 7, 2025, 3:55pm UTC](https://forums.unrealengine.com/t/quartz-clock-proxy-unstable-for-xbox-development/2633642/1 "2025-08-07T15:55:55Z")

</div>

While testing a dynamic music system on Xbox One X, periodically and seemingly randomly, the Quartz Clock or the Quartz Clock Proxy will become invalid when checked and then fail. This is a C++ implementation where I have saved the UQuartzClockHandle into a pointer after calling CreateNewClock from the Quartz Subsystem.

This is how I create a new Quartz Clock:

```auto
UQuartzClockHandle* Metronome = nullptr;

Metronome = QuartzSubsystem->CreateNewClock(WorldObject, "MyClock", settings);
if (Metronome->IsValidLowLevel())
{
	Metronome->SetBeatsPerMinute(WorldObject, quantizationBoundary, delegateBP, Metronome, CurrentSong->BPM);

	// Bind our beat event to the function
	BeatEvent.BindUFunction(this, "OnBeat");
	Metronome->SubscribeToQuantizationEvent(WorldObject, EQuartzCommandQuantization::Beat, BeatEvent, Metronome);
}

```

However, while testing it will consistently fail at:

```auto
Metronome->DoesClockExist(WorldObject)

```

And:

```auto
Metronome->GetEstimatedRunTime(WorldObject)

```

Even though in the previous line it checks to see if the Metronome or UQuartzClockHandle\* is valid.

These lines are consistently what causes the crashes:

```auto
[2025.07.16-09.22.49:512][478]LogXboxCommonOutputDevices: Error: [Callstack] 0x00007ff6739a5c5d Cobalt.exe!Audio::FQuartzClockProxy::DoesClockExist []

```

And

```auto
[2025.07.16-09.45.34:340][703]LogXboxCommonOutputDevices: Error: [Callstack] 0x00007ff79f75cc5d Cobalt.exe!Audio::FQuartzClockProxy::GetEstimatedClockRunTimeSeconds []

```

Is there anything that I missed with setting up the Quartz Clock or starting it that may cause a periodic crash from the Quartz Clock Proxy?