Swift Firebase Snapshot query missing child

Question

I store some settings in firebase database and reach this settings from app. It's working fine with the first 3 settings, but when I tried to add a new one, I can't reach this.

The code, what I use:

    func getLanguage(){
    ref = DatabaseRef.settingsRef
    //ref.observe(.value, with: { (snapshot) in
    ref.observeSingleEvent(of: .value, with: { (snapshot) in
        let valueL = snapshot.value as? NSDictionary
        if (valueL?.count)! > 0 {
            self.lang = ((valueL!["lang"])! as? String)!
        }
     })
}

DatabaseRef is a struct file to store all the references. settingsRef:

static let settingsRef = Database.database().reference().child("events").child(event).child("settings")

When I run this method, I got this error code on self.lang = ((valueL!["lang"])! as? String)!

Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

Ofcourse I double checked my database structure, and the path, but I can't figure out what is the problem, because my settings db looks like this:

     "settings" : {
         "contLog" : "true",
         "lang" : "en",
         "showStat" : "true",
         "useGate" : "true"
  },

And the snapshot looks like this:

PS: I know "true" is not bool, it's just for string test.

Answer 1

Thanks for your answers, it was a cache problem. When I deleted the app from my phone (and from simulator), and rebuild it, everything works fine. Somehow the iOS stored older snapshots..