NullReference exception durin pin updates

[IngweLand]

Tested on Android v 1.5.1 and 1.6.1, but might be valid for iOS as well as for latest versions.
The exception is thrown in private void UpdatePins(bool firstUpdate = true) because FormsMap is null. My scenario when exception occurred was as following: page with map is loaded, data for pins is requested from the server and pins are added to the screen, probably in the middle of this process user changes page to another one which removes map control and as a result FormsMap becomes null.

[vincentcastagna]

"probably in the middle of this process user changes page to another one which removes map control"

I'm sorry I dont understand the real flow you are having in your app.
What is the main page of your app ?
Where is the mapPage in the navigation stack ?

[duranvictor]

MapCenter = new Position(LatitudeValue, LongitudeValue);
MapRegion = MapSpan.FromCenterAndRadius(MapCenter, Distance.FromKilometers(GlobalSettings.fromKilometers));

when update