Collection <CALayerArray: 0x280fc9140> was mutated while being enumerated.

[Uk44]

private func displayImage(_ cgImage: CGImage, at index: Int) {

    if let imageView = contentView.viewWithTag(index) as? UIImageView {
        let uiimage = UIImage(cgImage: cgImage, scale: 1.0, orientation: UIImageOrientation.up)
        imageView.image = uiimage
          }
}

app crash on contentView.viewWithtag(index) give nill value