diff --git a/app/build.gradle b/app/build.gradle
index 1c9c204..60620b5 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 32
+    compileSdkVersion 33
     defaultConfig {
         applicationId "com.blackboxembedded.wunderlinqgopro"
         minSdkVersion 23
-        targetSdkVersion 32
-        versionCode 4
-        versionName "1.3"
+        targetSdkVersion 33
+        versionCode 5
+        versionName "1.4"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -21,9 +21,9 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.5.1'
+    implementation 'androidx.appcompat:appcompat:1.6.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    implementation 'com.google.android.material:material:1.7.0'
+    implementation 'com.google.android.material:material:1.8.0'
     implementation 'com.pes.materialcolorpicker:library:1.2.5'
     implementation 'androidx.preference:preference:1.2.0'
     implementation 'com.rarepebble:colorpicker:3.0.1'
diff --git a/app/src/main/java/com/blackboxembedded/wunderlinqgopro/DeviceScanActivity.java b/app/src/main/java/com/blackboxembedded/wunderlinqgopro/DeviceScanActivity.java
index e1cbfb1..7887ded 100644
--- a/app/src/main/java/com/blackboxembedded/wunderlinqgopro/DeviceScanActivity.java
+++ b/app/src/main/java/com/blackboxembedded/wunderlinqgopro/DeviceScanActivity.java
@@ -242,39 +242,41 @@ private void scanLeDevice(final boolean enable) {
                 (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED)) {
             bluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();
 
-            ScanSettings bleScanSettings = new ScanSettings.Builder()
-                    .setScanMode(ScanSettings.SCAN_MODE_BALANCED)
-                    .setCallbackType(ScanSettings.CALLBACK_TYPE_ALL_MATCHES)
-                    .build();
-            // devices UUID service mask
-            ParcelUuid parcelUuidMask = new ParcelUuid(UUID.fromString("0000FFFF-0000-0000-0000-000000000000"));
-
-            List<ScanFilter> bleScanFilter = new ArrayList<>();
-            ScanFilter.Builder builder = new ScanFilter.Builder().setServiceUuid(new ParcelUuid(UUIDDatabase.UUID_GOPRO_CONTROL_SERVICE), parcelUuidMask);
-            bleScanFilter.add(builder.build());
-            if (enable) {
-                // Stops scanning after a pre-defined scan period.
-                mHandler.postDelayed(new Runnable() {
-                    @Override
-                    public void run() {
-                        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.S ||
-                                (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED)) {
-                            mScanning = false;
-                            bluetoothLeScanner.stopScan(mLeScanCallback);
-                            startTimer();
+            if (bluetoothLeScanner != null) {
+                ScanSettings bleScanSettings = new ScanSettings.Builder()
+                        .setScanMode(ScanSettings.SCAN_MODE_BALANCED)
+                        .setCallbackType(ScanSettings.CALLBACK_TYPE_ALL_MATCHES)
+                        .build();
+                // devices UUID service mask
+                ParcelUuid parcelUuidMask = new ParcelUuid(UUID.fromString("0000FFFF-0000-0000-0000-000000000000"));
+
+                List<ScanFilter> bleScanFilter = new ArrayList<>();
+                ScanFilter.Builder builder = new ScanFilter.Builder().setServiceUuid(new ParcelUuid(UUIDDatabase.UUID_GOPRO_CONTROL_SERVICE), parcelUuidMask);
+                bleScanFilter.add(builder.build());
+                if (enable) {
+                    // Stops scanning after a pre-defined scan period.
+                    mHandler.postDelayed(new Runnable() {
+                        @Override
+                        public void run() {
+                            if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.S ||
+                                    (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED)) {
+                                mScanning = false;
+                                bluetoothLeScanner.stopScan(mLeScanCallback);
+                                startTimer();
+                            }
                         }
-                    }
-                }, SCAN_PERIOD);
+                    }, SCAN_PERIOD);
 
-                mScanning = true;
-                bluetoothLeScanner.startScan(bleScanFilter, bleScanSettings, mLeScanCallback);
-                if (cTimer != null){
-                    cancelTimer();
+                    mScanning = true;
+                    bluetoothLeScanner.startScan(bleScanFilter, bleScanSettings, mLeScanCallback);
+                    if (cTimer != null) {
+                        cancelTimer();
+                    }
+                } else {
+                    mScanning = false;
+                    bluetoothLeScanner.stopScan(mLeScanCallback);
+                    startTimer();
                 }
-            } else {
-                mScanning = false;
-                bluetoothLeScanner.stopScan(mLeScanCallback);
-                startTimer();
             }
         }
     }
diff --git a/build.gradle b/build.gradle
index bf25312..9be431a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.1'
+        classpath 'com.android.tools.build:gradle:7.4.1'
         
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files