title: App Crashing with EXC_BREAKPOINT Error
body: <p>I have an app I am making in Xcode 7.2. I have a main menu with a button that has a segue going to a settings view controller. The settings view controller has the following code and every time I get to that view controller it crashes with an EXC_BREAKPOINT error. The funny thing is that this only happens on my iPhone 4 running iOS 7. It does not crash in the iOS Simulator iPhone 6 running iOS 9.</p>
  
  <p>Anyways, here is the code.</p>
  
  <pre><code>//
  //  SettingsController.swift
  //  Arbor Hills iOS
  //
  //  Created by Andrew on 11/22/15.
  //  Copyright © 2015 Arbor Hills Vet. All rights reserved.
  //
  
  import UIKit
  
  class SettingsController: UITableViewController {
  
      @IBOutlet weak var username: UITextField!
      @IBOutlet weak var password: UITextField!
      @IBOutlet weak var notifications: UISwitch!
      override func viewDidLoad(){
          super.viewDidLoad()
  
          let defaults = NSUserDefaults.standardUserDefaults()
          let dusername = defaults.valueForKey("username")!
  
          let dpassword = defaults.valueForKey("password")!
          let dnotifications = defaults.valueForKey("notifications")!
  
          username!.text = String(dusername)
          password!.text = String(dpassword)
          if(dnotifications as! Bool == true){
              notifications.setOn(true, animated: true)
          }else{
              notifications.setOn(false, animated:true)
          }
      }
  
      @IBAction func saveUsername(sender: AnyObject) {
         let defaults = NSUserDefaults.standardUserDefaults()
          defaults.setObject(username.text!, forKey: "username")
      }
  
      @IBAction func savePassword(sender: AnyObject) {
          let defaults = NSUserDefaults.standardUserDefaults()
          defaults.setObject(password.text!, forKey: "password")
      }
  
      @IBAction func notificationsModified(sender: AnyObject) {
          let defaults = NSUserDefaults.standardUserDefaults()
          defaults.setObject(notifications.on, forKey: "notifications")
      }
  
      }
  </code></pre>