Need help I keep receiving this error "Thread 1: Fatal Error: Unexpectedly found nil while unwrapping an Optional value"

Question

var context = LAContext()

enum AuthenticationState {
    case loggedin, loggedout
}
var state = AuthenticationState.loggedout {
    
    didSet {
        loginButton.isHighlighted = state == .loggedin
        stateView.backgroundColor = state == .loggedin ?.white : .clear 
        faceIDLabel.isHidden = (state == .loggedin) || (context.biometryType != .faceID)
    }
}

Error appears in line 10. Unsure of what I need to change.