Ok. Thanks for help.

Cool. Thanks for help.

Ok. Alert never appeared again when I pressed OK. Still no clue as to why it happened.

Figured out the issue. When the model data is saved to file and reloaded, any attempts to add more items will cause the crash indicated above. This is reproducible when creating a Document App project using SwiftUI/Swift/SwiftData options.

I have an old simple die rolling app which uses ObjC and nibs. On macOS 14.7.1. whenever I click on another textedit field, the error is logged. I am doing a modernisation update as I was informed that my app has not be updated in a while.

I am not using UIKit in any way. It is pure SwiftUI. My guess is when the view the alert is displaying changes due to observed properties, the alert FW tries to redisplay the alert , sees it is already visible and emits the warning. I'll try to create a simple example over the next few days.

Submitted a bug to feedback assistant. FB16778512 Contains cutdown project which shows the bug.

Limited work around for the bug is to create a @State var in StdView. @State private var alertVis init(...) { ... self._alertVis = State(initialValue: HNCModel.instance.alertVis) } var body : some View { VStack { ... }.alert("text", isPresented: @alertVis) {...} } Setting HNCModel.alertVis vis showAlert() shows the alert and there is no 'Attempt to present...' warning. But the alert is not auto dismissed when the hncModel alertVis value is set to false.

Ignore previous post. Fix is limited.