diff --git a/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java b/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java
index 3559a744..3ca4c964 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java
@@ -248,7 +248,12 @@ public class MainActivity extends AppCompatActivity {
 
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
 
-        String deviceName = prefs.getString("btDeviceName", "MI_SCALE");
+        String deviceName = prefs.getString("btDeviceName", "-");
+
+        if (deviceName == "-") {
+            Toast.makeText(getApplicationContext(), getResources().getString(R.string.info_bluetooth_no_device_set), Toast.LENGTH_SHORT).show();
+            return;
+        }
 
         // Check if Bluetooth 4.x is available
         if (deviceName != "openScale_MCU") {
diff --git a/android_app/app/src/main/res/values-de/strings.xml b/android_app/app/src/main/res/values-de/strings.xml
index e5ad8967..419fa97a 100644
--- a/android_app/app/src/main/res/values-de/strings.xml
+++ b/android_app/app/src/main/res/values-de/strings.xml
@@ -158,4 +158,5 @@
     <string name="title_about">Info</string>
     <string name="open_drawer">öffnen</string>
     <string name="close_drawer">schließen</string>
+    <string name="info_bluetooth_no_device_set">Kein Bluetooth Gerät ausgewählt</string>
 </resources>
\ No newline at end of file
diff --git a/android_app/app/src/main/res/values/strings.xml b/android_app/app/src/main/res/values/strings.xml
index 734a96f1..3cddb676 100644
--- a/android_app/app/src/main/res/values/strings.xml
+++ b/android_app/app/src/main/res/values/strings.xml
@@ -104,6 +104,7 @@
     <string name="info_bluetooth_try_connection">Trying to connect to</string>
     <string name="info_bluetooth_connection_lost">Lost Bluetooth connection.</string>
     <string name="info_bluetooth_no_device">No Bluetooth device found</string>
+    <string name="info_bluetooth_no_device_set">No Bluetooth device selected</string>
     <string name="info_bluetooth_connection_successful">Connection successful established</string>
     <string name="info_bluetooth_init">Initialize Bluetooth device</string>
     <string name="info_bluetooth_connection_error">Bluetooth has an unexpected error</string>