Task.detached crashing on init

This empty app is crashing on load. I'm trying to execute a function on app load asynchronously, but it keeps crashing. I'm running macOS v11 (Big Sur) and Xcode 13 with Swift 5.5 and can't find what's wrong with it.

import SwiftUI

struct TestApp: App {

    init() {

    var body: some Scene {
        WindowGroup {
            VStack {

class Controller: ObservableObject {

    static let shared = Controller()

    @Published public var loaded = false
    @Published public var processing = false

    func load() {
        Task.detached {


It compiles and runs but immediately crashes. There is no error message, it just crashes with

Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)

on Controller.shared.load(). If you comment out the Task.detached block it runs normally, but of course it doesn't start loading the object in the background which is what I'm actually trying to do.


  • Answering my own question, it seemed to be somehow a bug related to the versions of Xcode 13.2.1 and macOS 11.7. If the project uses 11.7 as 'Deployment Target' I would get a crash, but if I change it to 11.6 it would work correctly. Go figure.