MTKView sometimes crashes when drawing CVImageBuffer

PlayerView.swift

import AppKit
import AVFoundation
import MetalKit

class PlayerView: MTKView {
    
    private var ciImage: CIImage? {
        didSet {
            renderImage()
        }
    }
    
    private lazy var commandQueue: MTLCommandQueue? = { [unowned self] in
        return self.device!.makeCommandQueue()
        }()
    
    private lazy var ciContext: CIContext = { [unowned self] in
        return CIContext(mtlDevice: self.device!)
        }()
    
    override init(frame frameRect: CGRect, device: MTLDevice?) {
        super.init(frame: frameRect, device:device)
        if super.device == nil {
            fatalError("No metal")
        }
        framebufferOnly = false
    }
    
    required init(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // sometimes crashes
    func renderImage() {
        if let currentDrawable = currentDrawable { // crashes here sometimes
            guard let ciImage = ciImage else { return }
            let commandBuffer = commandQueue?.makeCommandBuffer()
            let renderDestination = CIRenderDestination(mtlTexture: currentDrawable.texture, commandBuffer: commandBuffer)
            _ = try? ciContext.startTask(toRender: ciImage, to: renderDestination)
            commandBuffer?.present(currentDrawable)
            commandBuffer?.commit()
            draw()
        }
    }
    
    // this seems to work
    func renderImage1() {
        guard let currentDrawable = (layer as? CAMetalLayer)?.nextDrawable() else { return }
        guard let ciImage = ciImage else { return }
        let commandBuffer = commandQueue?.makeCommandBuffer()
        let renderDestination = CIRenderDestination(mtlTexture: currentDrawable.texture, commandBuffer: commandBuffer)
        _ = try? ciContext.startTask(toRender: ciImage, to: renderDestination)
        
        commandBuffer?.present(currentDrawable)
        commandBuffer?.commit()
    }
    
    func renderPixelBuffer(_ pixelBuffer: CVImageBuffer) {
        ciImage = CIImage(cvImageBuffer: pixelBuffer)
    }
}