ios - recuperar - post firebase

Controlador de vista descarte muy rápido después de guardar en Firebase

Question

cada vez que trato de guardar algo en la base de firebase, mi controlador falla, la aplicación no falla y la información se guarda, pero el controlador de vista se descarta muy rápido cuando intento guardarlo incluso si no descarto la vc. ¡Gracias por tu ayuda!

Aquí está mi viewController:

Ejemplo 1:

import UIKit

import FirebaseAuth
import FirebaseDatabase
import FirebaseStorage

class EditAccountVC: UITableViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate {

    @IBOutlet var profileImage: UIImageView!
    @IBOutlet var nameField: UITextField!
    @IBOutlet var emailField: UITextField!
    @IBOutlet var websiteField: UITextField!

    var user: Users!
    var imageChanged: Bool = false


        override func viewDidLoad() {
           super.viewDidLoad()

            DataService.ds.REF_USERS.child((FIRAuth.auth()?.currentUser?.uid)!).observe(.value) { (snapshot: FIRDataSnapshot) in
            if let postDict = snapshot.value as? Dictionary<String, AnyObject> {
            let key = snapshot.key
            self.user = Users(key: key, artistData: postDict)
            }
            if let user = self.user {
                self.nameField.text = user.name
                self.emailField.text = FIRAuth.auth()?.currentUser?.email
                self.websiteField.text = user.website
                self.profileImage.sd_setImage(with: URL(string: "/(self.user.profilePicUrl)") , placeholderImage: UIImage(named:"User-70") , options: .continueInBackground)
            }
        }
        //profileImage.addObserver(self, forKeyPath: "image", options: .new, context: nil)
    }

    //    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    //        print("IMAGE CHANGES")
    //    }

    @IBAction func doneBtnTapped(_ sender: Any) {
        let activityIndicator = UIActivityIndicatorView()
        activityIndicator.hidesWhenStopped = true
        activityIndicator.activityIndicatorViewStyle = .gray
        let spinner: UIBarButtonItem = UIBarButtonItem(customView: activityIndicator)
        self.navigationItem.rightBarButtonItem = spinner
        activityIndicator.startAnimating()

        let name = self.nameField.text!
        let email = self.emailField.text!
        let website = self.websiteField.text!


           FIRAuth.auth()?.currentUser?.updateEmail(email, completion: { (error) in
            if error != nil {
                print(error!.localizedDescription)
            }
           })

        let imageData = UIImageJPEGRepresentation(profileImage.image!, 1)
        let imagePath = "profileImage/(user.userId)userPic.jpeg"
        let imageRef = STORAGE.child(imagePath)
        let metaData = FIRStorageMetadata()
        metaData.contentType = "image/jpeg"

        imageRef.put(imageData!, metadata: metaData) { (metaData, error) in
            let changeRequest = FIRAuth.auth()?.currentUser?.profileChangeRequest()
            changeRequest?.displayName = name

            if let photoUrl = metaData!.downloadURL() {
                changeRequest?.photoURL = photoUrl
            }

            changeRequest?.commitChanges(completion: { (error) in
                if error == nil {
                    let user = FIRAuth.auth()!.currentUser!
                    let userInfo = ["email": email, "name": name, "website": website, "uid": user.uid, "profileImg": String(describing: user.photoURL!)] as [String : Any]
                    let userRef = DataService.ds.REF_USERS.child(user.uid)
                    userRef.updateChildValues(userInfo, withCompletionBlock: { (error, reference) in

                    })
                }

            })
        }
    }


    @IBAction func editImageBtnTapped(_ sender: Any) {
        let alert = Alerts()
        alert.changeProfilePicture(self)

    }


    @IBAction func cancelBtnTapped(_ sender: Any) {
        _ = navigationController?.popViewController(animated: true)
    }

    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 1.0
    }


    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerEditedImage] as! UIImage
        profileImage.image = image
        self.imageChanged = true
        picker.dismiss(animated: true, completion: nil)

    }
}