Displaying HTML text in UITextView crash occurred in swift 4?

I am using this code snipped

var htmlToAttributedString: NSAttributedString? {
    guard let data = data(using: .utf8) else { return NSAttributedString() }
    do {
        return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil) // Get crash on this line
    } catch let error {
        print(error.localizedDescription)
        return NSAttributedString()
    }
}

var htmlToString: String {
    return htmlToAttributedString?.string ?? ""
}

showing HTML text in UITableViewCell

cell.textViewMessage.attributedText = msg.htmlToAttributedString

Launching first time there is no crash but after that when I run the code got a crash and not working after that.

Thread 1: EXC_BAD_ACCESS (code=1, address=0x10)

#Edit HTML String to display in cell

<p>Here\'s a short video tour.  Press play to start.</p><br><iframe class=\"ql-video\" frameborder=\"0\" allowfullscreen=\"true\" src=\"https://www.youtube.com\"></iframe><br>

#Edit 1 - I am trying to run this code in Playground and it's just working fine except now it's showing an error. Please see the attached image

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