Strange #NullIsland warning from CoreMotion.framework

Question

Since recently, I get in the Xcode logs a lot of strange warnings from the CoreMotion framework, related to function getLocationForBundleID:

[Client] {"msg":"#NullIsland Either the latitude or longitude was exactly 0! That's highly unlikely", "latIsZero":0, "lonIsZero":0}  
[Client] {"msg":"#NullIsland Received a latitude or longitude from getLocationForBundleID that was exactly zero", "latIsZero":0, "lonIsZero":0, "location":'28 5B E0 D7 EB 7F 00 00'}  

I do not see any malfunction of my app. So maybe these logs can be ignored, but they are annoying anyway.

My questions are:

How can I correct a potential error?
How can I stop these warnings?

Answer 1

Apparently this error message is logged if property location of a CLLocationManager is read, before the CLLocationManager delivered the very first location.

My solution is the following:
I use anyway a subclass of CLLocationManager that allows me to set the location property for tests programmatically. This is done as follows:

private var _location: CLLocation?
@objc dynamic override var location: CLLocation? {
    get { 
        let usedLocation = _location ?? super.location // Here the error is logged if no location has been delivered yet
        return usedLocation 
    }
    set {
        _location = newValue
    }   
}

This subclass has now an additional property

  var anyLocationDelivered = false  

that is set true in

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        locationManager.anyLocationDelivered = true
    // …
  }  

and the getter is now

get { 
    guard anyLocationDelivered else { return nil }
    let usedLocation = _location ?? super.location
    return usedLocation 
}  

Now this error message is no longer logged.