Failed to parse font key token is displayed at console. It doesn't particularly cause crashes, UI bugs, etc., but it is a concern. This is occurred when I zoom on SwiftUI Map. Part of code struct MapView: View { var body: some View {     Map(coordinateRegion: $viewModel.region,       showsUserLocation: true,       annotationItems: viewModel.pins,       annotationContent: { item in       MapAnnotation(coordinate: item.coordinate, anchorPoint: CGPoint(x: 0.5, y: 0.5), content: {         pinButton(pin: item)       })     })     .ignoresSafeArea()   } } My project is here.

I wrote as follows. An error occurred on line 14 because of forced unwrapping. extension SignInViewController: ASAuthorizationControllerDelegate { @available(iOS 13.0, *) func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) { var name: String? = nil if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential { if let fname = appleIDCredential.fullName?.familyName { name = fname } if let gname = appleIDCredential.fullName?.givenName {name = name == nil ? gname : name!+gname} authenticateWithApple(token: appleIDCredential.identityToken?.toString, code: appleIDCredential.authorizationCode?.toString, name: name) } } func authenticateWithApple(token: String?, code: String?, name: String?) { authenticationScenario.signOut(from: .apple) let param = [LQAAccountAppleTokenKey:token!, LQAAccountAppleAuthorizationCode:code!] ... } } I fixed it by rewriting as below, but I would like to know why nil is included in identityToken or authorizationCode. guard let identityToken = appleIDCredential.identityToken, let idTokenString = String(data: identityToken, encoding: .utf8) else { return } guard let authorizationCode = appleIDCredential.authorizationCode, let authCodeString = String(data: authorizationCode, encoding: .utf8) else { return }