CameraKit crashes if on audio call (iOS)

Hi @aidan, thank you for reporting this and your patience while we looked into it. It may be that the compass, microphone, or some other sensor--used by ARKit in this case--are unavailable during a call; hence the message: "Code=102 'Required sensor failed' ". (Well, maybe "sensor is unavailable" would've been more apt.)

To handle this case, more generally, you might handle the interruption: stop your ARSessionInput and AVSessionInput when a user gets a call and start once the interruption has ended. As a rough example you might implement the handing of interruptions along these lines:

NotificationCenter.default.addObserver(self, selector: #selector(wasInterrupted), name: 
     .AVCaptureSessionWasInterrupted, object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(interruptionEnded), name:
     .AVCaptureSessionInterruptionEnded, object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(interruptionEnded), name:
     UIApplication.didBecomeActiveNotification, object: nil)

Or whatever cases you wish to handle, and then stop and start your inputs:

    @objc
    func wasInterrupted() {
        cameraController?.arInput.stopRunning()
        cameraController?.cameraInput?.stopRunning()
    }

    @objc
    func interruptionEnded() {
        if cameraController?.arInput.isRunning == false {
            cameraController?.arInput.startRunning()
            cameraController?.cameraInput?.startRunning()
        }
    }

Let us know whether this addresses the issue or if you have any further questions. Thanks again.

Appreciate the use case and feedback @aidan. Another potential cause here is that the microphone is unavailable during a call. I have asked our team to investigate. Thanks again for reporting this