diff --git a/example/ios/Runner/Info.plist b/example/ios/Runner/Info.plist
index b5a66b3..10de3d3 100644
--- a/example/ios/Runner/Info.plist
+++ b/example/ios/Runner/Info.plist
@@ -41,5 +41,9 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>NSCameraUsageDescription</key>
+	<string>This app requires access to the camera.</string>
+	<key>NSPhotoLibraryUsageDescription</key>
+	<string>This app requires access to the photo library.</string>
 </dict>
 </plist>
diff --git a/example/pubspec.lock b/example/pubspec.lock
index 7333704..bedfe3c 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.8.1"
+    version: "2.8.2"
   boolean_selector:
     dependency: transitive
     description:
@@ -21,7 +21,7 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   charcode:
     dependency: transitive
     description:
@@ -183,7 +183,7 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10"
+    version: "0.12.11"
   meta:
     dependency: transitive
     description:
@@ -272,7 +272,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.2"
+    version: "0.4.3"
   typed_data:
     dependency: transitive
     description:
@@ -286,7 +286,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
 sdks:
   dart: ">=2.14.0 <3.0.0"
   flutter: ">=2.5.0"
diff --git a/lib/src/google_map.dart b/lib/src/google_map.dart
index 5021289..2a5b00a 100644
--- a/lib/src/google_map.dart
+++ b/lib/src/google_map.dart
@@ -87,8 +87,8 @@ class _GoogleTrackTraceMapState extends State<GoogleTrackTraceMap> {
 
   DateTime lastRouteUpdate = DateTime.now();
 
-  late final Timer routeCalculateTimer;
-  late final Timer markerUpdateTimer;
+  Timer? routeCalculateTimer;
+  Timer? markerUpdateTimer;
 
   @override
   void initState() {
@@ -105,9 +105,9 @@ class _GoogleTrackTraceMapState extends State<GoogleTrackTraceMap> {
 
   @override
   void dispose() {
+    routeCalculateTimer?.cancel();
+    markerUpdateTimer?.cancel();
     controller.dispose();
-    routeCalculateTimer.cancel();
-    markerUpdateTimer.cancel();
     super.dispose();
   }
 
@@ -206,6 +206,10 @@ class _GoogleTrackTraceMapState extends State<GoogleTrackTraceMap> {
           (widget.timerPrecision == TimePrecision.everyMinute) ? 60 : 1;
       markerUpdateTimer =
           Timer.periodic(Duration(seconds: updateInterval), (timer) {
+        if (mounted) {
+          timer.cancel();
+          return;
+        }
         if (controller.route != null) {
           checkDestinationCloseBy();
           controller.route = TrackTraceRoute(
@@ -252,8 +256,8 @@ class _GoogleTrackTraceMapState extends State<GoogleTrackTraceMap> {
           controller.end.position,
         ) <
         widget.markerUpdatePrecision) {
-      routeCalculateTimer.cancel();
-      markerUpdateTimer.cancel();
+      routeCalculateTimer?.cancel();
+      markerUpdateTimer?.cancel();
       if (controller.route != null) {
         controller.route!.line = <PointLatLng>[controller.route!.line[1]];
         controller.route!.distance = 0;