Im getting Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value when trying to use my tab bar from a specific view

Question

I have my homeview with some tab bar buttons which lead to different views, but when I try to use it when i get into my ContentView which is a map, I get this error: Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value which points to

NavigationLink(destination: mapView(name: self.name,
                                    geopoints: self.obs.data["data"]

Any ideas how can i fix it?

This is part of my homeView

struct HomeView: View {
    @ObservedObject var authenticationViewModel: AuthenticationViewModel
    @StateObject var linkViewModel: LinkViewModel = LinkViewModel()
    
    var body: some View {
        NavigationView {
            TabView{
                VStack {
                    Text("Welcome back, \(authenticationViewModel.user?.email ?? "No user")")
                        .padding(.top, 32)
                    Spacer()
                    LinkView(linkViewModel: linkViewModel)
                }
                .tabItem {
                    Label("Home", systemImage: "house.fill")
                }
                ContentView()
                    .tabItem {
                        Label("Car Location", systemImage: "car.fill")
                    }
                ProfileView(authenticationViewModel: authenticationViewModel)
                    .tabItem {
                        Label("Profile", systemImage: "person.fill")
                    }
                
            }
            
            .navigationBarTitleDisplayMode(.inline)
            .navigationTitle("Home")
            .toolbar {
                Button("Logout") {
                    authenticationViewModel.logout()
                }
            }
        }
    }
}

And this is my ContentView

import SwiftUI
import Firebase
import FirebaseFirestore
import CoreLocation
import MapKit

struct ContentView: View {
    @State var name = ""
    @ObservedObject var obs = observer()
    
    
    var body: some View {
        
        NavigationView{
            VStack{
                TextField("Enter Name", text:
                            $name).textFieldStyle(RoundedBorderTextFieldStyle())
                    
                if name != ""{
                    NavigationLink(destination: mapView(name: self.name,
                                                        geopoints: self.obs.data["data"] as! [String: GeoPoint])
                        .navigationBarTitle("", displayMode: .inline)) {
                        Text("Share Location")
                    }
                }
            }.padding()
             .navigationBarTitle("Location sharing")
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

struct mapView : UIViewRepresentable {
    var name = ""
    var geopoints : [String : GeoPoint]
    
    func makeCoordinator() -> mapView.Coordinator {
        return mapView.Coordinator(parent1: self)
    }
    
    
    let map = MKMapView()
    let manager = CLLocationManager()
    
    func makeUIView(context: UIViewRepresentableContext<mapView>) -> MKMapView {
        manager.delegate = context.coordinator
        manager.startUpdatingLocation()
        map.showsUserLocation = true
        let center = CLLocationCoordinate2D(latitude: 19.53581037522986,
                                            longitude: -99.22177511718445)
        let region = MKCoordinateRegion(center: center, latitudinalMeters: 1000,
                                                        longitudinalMeters: 1000)
        map.region = region
        manager.requestWhenInUseAuthorization()
        return map
    }
    func updateUIView(_ uiView: MKMapView, context: UIViewRepresentableContext<mapView>) {
        for i in geopoints{
            
            if i.key != name{
                let point = MKPointAnnotation()
                point.coordinate = CLLocationCoordinate2D(latitude: i.value.latitude,
                                                          longitude: i.value.longitude)
                point.title = i.key
                uiView.removeAnnotations(uiView.annotations)
                uiView.addAnnotation(point)
            }
        }
    }
    
    class Coordinator : NSObject, CLLocationManagerDelegate{
        var parent: mapView
        
        init(parent1 : mapView){
            parent = parent1
        }
        
        func locationManager(_ manager: CLLocationManager,
                             didChangeAuthorization status: CLAuthorizationStatus) {
            if status == .denied{
                
                print("Denied")
            }
            if status == .authorizedWhenInUse{
                
                print("Authorized")
            }
        }
        
        func locationManager(_ manager: CLLocationManager,
                             didUpdateLocations locations: [CLLocation]) {
            
            let last = locations.last
            let db = Firestore.firestore()
            
            db.collection("locations").document("qdEq1Pixu0GHHZjVT1MV")
                .setData(["updates" : [self.parent.name : GeoPoint(latitude: (last?.coordinate.latitude)!,
                                                                   longitude: (last?.coordinate.longitude)!)]],
                         merge: true) {
                    
                    (err) in
                    if err != nil{
                        print((err?.localizedDescription)!)
                        return
                    }
                    print("Sucess")
                }
        }
    }
}

class observer : ObservableObject{
    @Published var data = [String : Any]()
    
    init() {
        let db = Firestore.firestore()
        
        db.collection("locations").document("qdEq1Pixu0GHHZjVT1MV").addSnapshotListener { (snap, err)
            in
            
            if err != nil{
                print((err?.localizedDescription)!)
                return
            }
            
            let updates = snap?.get("updates") as! [String : GeoPoint]
            
            self.data["data"] = updates
        }
    }
}

I tried changing variable declarations but didn't worked. Any help is appreciated.