SCNAction playAudio seems to cause a crash

Hello,

I am seeing a crash in SceneKit that I was not seeing before iOS 13.1.2.

I’ve traced the issue to the following function and cannot completely suss out what is causing the issue.

If I comment out the line which runs the action on the node, all is well.

I can run playAudio actions on other pre-existing nodes in the scene but when I simply want to have a one-shot sound play using the below function, the app crashes.

So my thought is that perhaps this has something to do with the way I am instantiating the node but I cannot think of another way to instantiate a node just to play a sound at a given position.

I’ve also tried using a recycled audio source but that makes no difference.

Might anyone have any ideas what might be going on in this code to cause a crash? It’s just not obvious to me, especially since this had worked flawlessly before the iOS updates.

I’ve included the back trace below.

Thanks so much for any help / ideas!

Cheers!

func play(sound: String, atPosition: SCNVector3, volume: Float, pitch: Float, loops: Bool, positional: Bool) {

// Sources will be pre-loaded and recycled for the finished app

if let source = SCNAudioSource(fileNamed: "art.scnassets/"+sound)

{

source.volume = volume

source.rate = pitch

source.isPositional = positional

source.shouldStream = false

source.loops = loops

source.load()

let node = SCNNode()

node.name = "oneShot"

node.position = atPosition

scnScene.rootNode.addChildNode(node)

// node.runAction(SCNAction.sequence([SCNAction.playAudio(source, waitForCompletion: true), SCNAction.removeFromParentNode()]))

// This line causes the crash

node.runAction(SCNAction.playAudio(source, waitForCompletion: false))

}

}

thread #14, name = 'com.apple.scenekit.scnview-renderer', queue = 'com.apple.scenekit.renderingQueue.SCNView0x105a11e90', stop reason = EXC_BAD_ACCESS (code=1, address=0x830b67ea0)

• frame #0: 0x00000001b08d7030 libobjc.A.dylibobjc_retain + 16

frame #1: 0x00000001bd5a90c4 AVFAudio-[AVAudioPlayerNode didAttachToEngine:] + 140 frame #2: 0x00000001bd5b66e8 AVFAudioAVAudioEngineImpl::AttachNode(AVAudioNode*, bool) + 272