Bug is in UIKitMacHelper [UINSApplicationDelegate sharedDelegate]

It's better to add conditional compilation. In this way code will compile and work correct in Xcode 14 and 15. extension WidgetConfiguration { func contentMarginsDisabledIfAvailable() -> some WidgetConfiguration { #if compiler(>=5.9) // Xcode 15 if #available(iOSApplicationExtension 17.0, *) { return self.contentMarginsDisabled() } else { return self } #else return self #endif } }