diff --git a/example/pubspec.lock b/example/pubspec.lock
index 001075b..309f701 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -166,7 +166,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "1.0.0"
+    version: "1.0.1"
   http:
     dependency: transitive
     description:
diff --git a/lib/src/ui/reader_widget.dart b/lib/src/ui/reader_widget.dart
index 93170c5..c96ce86 100644
--- a/lib/src/ui/reader_widget.dart
+++ b/lib/src/ui/reader_widget.dart
@@ -126,27 +126,27 @@ class _ReaderWidgetState extends State<ReaderWidget>
   List<CameraDescription> cameras = <CameraDescription>[];
   CameraDescription? selectedCamera;
   CameraController? controller;
-  bool _cameraOn = false;
+
+  // true when code detecting is ongoing
+  bool _isProcessing = false;
+  bool _isCameraOn = false;
+  bool _isFlashAvailable = true;
+  bool _isMultiScan = false;
 
   double _zoom = 1.0;
   double _scaleFactor = 1.0;
   double _maxZoomLevel = 1.0;
   double _minZoomLevel = 1.0;
 
-  bool isAndroid() => Theme.of(context).platform == TargetPlatform.android;
-
-  // true when code detecting is ongoing
-  bool _isProcessing = false;
-
-  bool isMultiScan = false;
-
   Codes results = Codes();
 
+  bool isAndroid() => Theme.of(context).platform == TargetPlatform.android;
+
   @override
   void initState() {
     super.initState();
     WidgetsBinding.instance.addObserver(this);
-    isMultiScan = widget.isMultiScan;
+    _isMultiScan = widget.isMultiScan;
     initStateAsync();
   }
 
@@ -174,7 +174,7 @@ class _ReaderWidgetState extends State<ReaderWidget>
 
     switch (state) {
       case AppLifecycleState.resumed:
-        if (cameras.isNotEmpty && !_cameraOn) {
+        if (cameras.isNotEmpty && !_isCameraOn) {
           onNewCameraSelected(cameras.first);
         }
         break;
@@ -182,7 +182,7 @@ class _ReaderWidgetState extends State<ReaderWidget>
       case AppLifecycleState.paused:
         controller?.dispose();
         setState(() {
-          _cameraOn = false;
+          _isCameraOn = false;
         });
         break;
       case AppLifecycleState.detached:
@@ -202,7 +202,7 @@ class _ReaderWidgetState extends State<ReaderWidget>
   void rebuildOnMount() {
     if (mounted) {
       setState(() {
-        _cameraOn = true;
+        _isCameraOn = true;
       });
     }
   }
@@ -239,6 +239,7 @@ class _ReaderWidgetState extends State<ReaderWidget>
     try {
       await cameraController.setFlashMode(FlashMode.off);
     } catch (e) {
+      _isFlashAvailable = false;
       debugPrint('Error: $e');
     }
 
@@ -316,7 +317,7 @@ class _ReaderWidgetState extends State<ReaderWidget>
   @override
   Widget build(BuildContext context) {
     final bool isCameraReady = cameras.isNotEmpty &&
-        _cameraOn &&
+        _isCameraOn &&
         controller != null &&
         controller!.value.isInitialized;
     final Size size = MediaQuery.of(context).size;
@@ -389,7 +390,9 @@ class _ReaderWidgetState extends State<ReaderWidget>
                   child: Row(
                     mainAxisSize: MainAxisSize.min,
                     children: <Widget>[
-                      if (widget.showFlashlight && isCameraReady)
+                      if (widget.showFlashlight &&
+                          isCameraReady &&
+                          _isFlashAvailable)
                         IconButton(
                           onPressed: _onFlashButtonTapped,
                           color: Colors.white,
@@ -420,12 +423,12 @@ class _ReaderWidgetState extends State<ReaderWidget>
         if (widget.onMultiScanModeChanged != null)
           SafeArea(
             child: ScanModeDropdown(
-              isMultiScan: isMultiScan,
+              isMultiScan: _isMultiScan,
               alignment: widget.multiScanModeAlignment,
               padding: widget.multiScanModePadding,
               onChanged: (bool value) {
                 setState(() {
-                  isMultiScan = value;
+                  _isMultiScan = value;
                 });
                 widget.onMultiScanModeChanged?.call(value);
               },
diff --git a/zxscanner/pubspec.lock b/zxscanner/pubspec.lock
index 2342760..48f9ccd 100644
--- a/zxscanner/pubspec.lock
+++ b/zxscanner/pubspec.lock
@@ -77,10 +77,10 @@ packages:
     dependency: transitive
     description:
       name: build_resolvers
-      sha256: "7c35a3a7868626257d8aee47b51c26b9dba11eaddf3431117ed2744951416aab"
+      sha256: db49b8609ef8c81cca2b310618c3017c00f03a92af44c04d310b907b2d692d95
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.2.0"
   build_runner:
     dependency: "direct dev"
     description:
@@ -601,10 +601,10 @@ packages:
     dependency: "direct main"
     description:
       name: mobx
-      sha256: f1862bd92c6a903fab67338f27e2f731117c3cb9ea37cee1a487f9e4e0de314a
+      sha256: "6738620307a424d2c9ad8b873f4dce391c44e9135eb4e75668ac8202fec7a9b8"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.3+1"
+    version: "2.1.4"
   mobx_codegen:
     dependency: "direct dev"
     description:
@@ -934,10 +934,10 @@ packages:
     dependency: transitive
     description:
       name: universal_io
-      sha256: "79f78ddad839ee3aae3ec7c01eb4575faf0d5c860f8e5223bc9f9c17f7f03cef"
+      sha256: "06866290206d196064fd61df4c7aea1ffe9a4e7c4ccaa8fcded42dd41948005d"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.4"
+    version: "2.2.0"
   url_launcher:
     dependency: "direct main"
     description: