Crash on IOS 11

[talk2cerlin]

I have a UITableView which has list of users with their profile pic. I used image?.roundCornersToCircle() to round the image since the height and width of `UIImageView were not same.

But in IOS 11, it crashes in this method UIImage.applyAlpha() -> UIImage?.

Crashlytics suggests that let imageWithAlpha = UIImage(cgImage: (offscreenContext?.makeImage()!)!) line caused the crash.

I have attached the image which was creating this issue below. (The image is in white color)

[HelloiWorld]

suggest don't use "!" anytime
I remove all the "!" in my project