swift - CoreData EXC_BAD_ACCESS（代码= 1，地址= 0x0））

Question

当我尝试访问CoreData中的作者项时，我收到EXC_BAD_ACCESS错误。

当我尝试访问author.authorName

时，我遇到了错误

func setupAuthorList(){        
        var error: NSError?
        let request = NSFetchRequest(entityName: "AuthorList")
        let results = self.context!.executeFetchRequest(request, error: &error) as! [AuthorList]

        if let _error = error {
            println("\(_error.localizedDescription)")
        } else {
            for author in results {
                println("\(author.authorName)")
            }
        }
        self.authorLabel.text = author!.authorName
        let urlString = author!.authorImage
        let url = NSURL(string: urlString)
        self.avatarImageView.layer.cornerRadius = self.avatarImageView.frame.size.width/2
        self.avatarImageView.clipsToBounds = true
        self.avatarImageView.hnk_setImageFromURL(url!)
        self.newspaperLabel.text = author!.newspaperName
    }