How to suppress a specify error in RxSwift?

When run in Debug scheme, there is a fatal error in line 30, if you code are something like this.

https://github.com/ReactiveX/RxSwift/blob/master/RxSwift/Observables/Implementations/Sink.swift

rxFatalError("Warning: Recursive call or synchronization error!")

If I choose run scheme from Debug to Release. The fatal error won't show. But I wonder if I could do something to suppress it.

class ViewController4: UIViewController {
    var v = Variable(0)
    var disposeBag = DisposeBag()
    var notiBag = DisposeBag()

    override func viewDidLoad() {
        super.viewDidLoad()

        v.asObservable()
            .subscribe(onNext: { _ in
                let noti = Notification(name: MyNotificationName)
                NotificationCenter.default.post(noti)
            })
            .disposed(by: disposeBag)

        NotificationCenter.default.rx.notification(MyNotificationName)
            .subscribe(onNext: { [unowned self] _ in
                if self.v.value == 10 { self.notiBag = DisposeBag() }
                else { self.v.value += 1 } // this line cause the issue
                print(self.v.value)
                self.counterTextView.text! += "\(self.v.value)\n"
            })
            .disposed(by: notiBag)
        v.value = 0
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBOutlet weak var counterTextView: UITextView!
}

let MyNotificationName = Notification.Name.init(rawValue: "My Notification Name")

This fatal error appears only in debug mode because it calls rxFataError only when you compile for debug. Its defined like this:

#if DEBUG
    if AtomicIncrement(&_numberOfConcurrentCalls) > 1 {
        rxFatalError("Warning: Recursive call or synchronization error!")
    }

    defer {
        _ = AtomicDecrement(&_numberOfConcurrentCalls)
    }
#endif

I just got this fatal error after an RxSwift update (3.4.0). My code updated Variable value in concurrent queue. Changed to serial queue fixed this crash.

Thierry