In my app I downloaded and installed the pods including Firebase/FirebaseAuth/FirebaseDatabase/FirebaseStorage/etc, used FIRApp.configure() in my AppDelegate, etc. I successfully logged users in and out and was able to upload/download data. All of a sudden Firebase isn't recognizing my user UUID. I'm not sure why but it just stopped.

Once the app loads everything is fine (still no UUID but the app actually loads) but if I try to go to a screen that would have to connect to Firebase to get upload/download data it crashes. It happens on every screen that needs to access Firebase but not the other ones. I added a ColorController view controller below to show the line the crash happens on.

In my AppDelegate 'didFinishLaunchingWithOptions' I added some code to check wether the app is connected to Firebase and it logs as "successfully connected". However I also added some code to check for the UUID in a print statement and it returns nil.

Any ideas?

```
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
import FirebaseStorage
import GoogleMaps

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    override init() {
        super.init()

        //Configure App for FireBase
        FIRApp.configure()

        //Firebase app Offline Updates
        FIRDatabase.database().persistenceEnabled = true

        GMSServices.provideAPIKey("myAPIKey")
    }//end override init

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    //Make sure the app is connected to Firebase
    let connectedRef = FIRDatabase.database().referenceWithPath(".info/connected")
    connectedRef.observeEventType(.Value, withBlock: { 

        (connected) in

    let currentUserID = FIRAuth.auth()?.currentUser?.uid

    if let boolean = connected.value as? Bool where boolean == true {
         //This line successfully prints
         print("\nApp Delegate: Firebase is successfully connected\n")
         print("\nApp Delegate: UUID is \(currentUserID)\n")
    } else {
         print("\nApp Delegate: Firebase is NOT connected\n")
         }
   })

    if currentUserID != nil{
         print("\nApp Delegate: UUID is \(currentUserID)\n")
    } else{
         //These 2 lines print and UUID prints as "nil"
         print("\nApp Delegate: No User ID Available\n")
         print("\nApp Delegate: UUID is \(currentUserID)\n")
    }
}

```

Here is one of the view controllers that has access to Firebase but crashes

```
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase

class ColorController: UIViewController {

@IBOutlet weak var colorLabel: UILabel!

var dbRef: FIRDatabaseReference!
let userID = FIRAuth.auth()?.currentUser?.uid

override func viewDidLoad() {
      super.viewDidLoad()

   //I tried both of these Separately. I commented out the one I didn't use
   self.dbRef = FIRDatabase.database().referenceFromURL("https://myApp.firebaseio.com")

   //I also tried switching to
   self.dbRef = FIRDatabase.database().reference()
}

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(true)

   let usersRef = self.dbRef.child("users")//it crashes on this line
   let userIDRef = usersRef.child(userID!)
   let colorData = userIDRef.child("colorData")

   colorData.observeEventType(.Value, withBlock: {

        (snapshot) in

      if let dict = snapshot.value as? [String:AnyObject]{

         let chosenColor = dict["chosenColor"] as? String

         self.colorLabel = chosenColor!
    }
  })
 }
}

```

Here is the crash from the ColorController

```
//this is from line 'let usersRef = self.dbRef.child("users")'
Thread1: EXC_BAD_INSTRUCTION (code=EXC_1386_INVOP, subcode=0x0)

```