fix map

lib/feature/map/map_screen.dart

@@ -59,6 +59,7 @@ class _MapScreenState extends State<MapScreen> with WidgetsBindingObserver {
   Timer? checkThemeTimer;
   Timer? getMarker;
   String themeMode = '';
+  bool _isDisposed = false;
   @override
   void initState() {
     super.initState();
@@ -74,18 +75,20 @@ class _MapScreenState extends State<MapScreen> with WidgetsBindingObserver {
 
   @override
   void dispose() {
+    _isDisposed = true;
     checkThemeTimer?.cancel();
     getMarker?.cancel();
-    _controller = Completer();
     streamController.close();
     super.dispose();
   }
 
   void onMapCreated(GoogleMapController controller) {
-    _controller.complete(controller);
-    streamController.add(controller);
-    clusterManager.setMapId(controller.mapId);
-    checkTheme();
+    if (!_isDisposed && !streamController.isClosed) {
+      _controller.complete(controller);
+      streamController.add(controller);
+      clusterManager.setMapId(controller.mapId);
+      checkTheme();
+    }
   }
 
   @override
@@ -173,11 +176,11 @@ class _MapScreenState extends State<MapScreen> with WidgetsBindingObserver {
     return ClusterManager<Device>(
       devices,
       _updateMarkers,
-      markerBuilder: _getmarkerBuilder(),
+      markerBuilder: _getMarkerBuilder(),
     );
   }
 
-  Future<Marker> Function(Cluster<Device>) _getmarkerBuilder() =>
+  Future<Marker> Function(Cluster<Device>) _getMarkerBuilder() =>
       (cluster) async {
         return Marker(
           markerId: MarkerId(