How to fix SwiftUI environnementObject error on AppStore crash?

My app on AppStore got two crashes that look very similar.This crash seems to append when I call function that use a environnement object SubscriptionManager.

By analysing the error stack I think It happens in the function safeAddExercice() when I try to get self.subscriptionManager that is the environnement object.

These are errors stacks :

That is the function safeAddExercice() :

private func safeAddExercice() {        if Exercice.canAddNew(for: self.subscriptionManager) {            self.showExerciceAdd = true        }else{            self.showMember = true        }    }

It's a function of ExerciceList :

struct ExerciceList: View {    //some other environnement objects...    @EnvironmentObject var subscriptionManager: SubscriptionManager...}

ExerciceList is an item of TabBar :

struct MainApp: View {    //some other envObjects...    @EnvironmentObject var subscriptionManager: SubscriptionManager    ...    var body: some View {        UIKitTabView{            ExerciceList(selection: .constant(nil))                .environment(\.managedObjectContext, managedObjectContext)                .environmentObject(userSettings)                .environmentObject(subscriptionManager)                .tab(title: NSLocalizedString("My exercises", comment: ""), image: "dumbell")...}}

SubscriptionManager is instantiated in AppDelegate :

var subscriptionManager: SubscriptionManager = {        SubscriptionManager()    }()

And pass to MainApp in SceneDelegate:

let subscriptionManager = (UIApplication.shared.delegate as! AppDelegate).subscriptionManager        let contentView = MainApp().environment(\.managedObjectContext, context)            .environmentObject(subscriptionManager)...

Crash appends both on iOS 13 and 14. I try to find a moment where I missed to inject object but I'm struggling a bit to find something.