Switch filters

[pxc052]

Hi, I want to switch between filters but the camera just freeze.
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
camera.removeAllTargets()
currentFilter?.removeAllTargets()
let filter = filters[indexPath.item]
currentFilter = filter
camera.addTarget(currentFilter)
currentFilter.addTarget(renderView)
}