Add preventive check in style observer.

mapbox · Aug 18, 2020 · 5d4b6bf · 5d4b6bf
1 parent d31b632
commit 5d4b6bf
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/MapboxNavigation/NavigationMapView.swift b/MapboxNavigation/NavigationMapView.swift
@@ -278,6 +278,7 @@ open class NavigationMapView: MGLMapView, UIGestureRecognizerDelegate {
  installUserCourseView()
 
  styleObservation = observe(\.style, options: .new) { [weak self] (mapView, change) in
+ guard change.newValue != nil else { return }
  guard let self = self else { return }
 
  if let routes = self.routes, let currentRoute = routes.first {