Strange behaviour on delete about hfcardcollectionviewlayout HOT 1 CLOSED

var index = 0
if(self.cardCollectionViewLayout!.revealedIndex >= 0) {
    index = self.cardCollectionViewLayout!.revealedIndex
}
self.cardCollectionViewLayout?.flipRevealedCardBack(completion: {
    self.colorArray.remove(at: index)
    self.collectionView?.deleteItems(at: [IndexPath(item: index, section: 0)])
    self.cardCollectionViewLayout?.unrevealCard(completion: {
        if(self.colorArray.count == 1) {
            self.cardCollectionViewLayout?.revealCardAt(index: 0)
        }
    })
})