diff --git a/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java b/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java
index a2529f3e..bf3cf998 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java
@@ -307,7 +307,7 @@ public class BluetoothPreferences extends PreferenceFragment {
         super.onStart();
 
         // Restart discovery after e.g. orientation change
-        if (btScanner.getDialog() != null) {
+        if (btScanner.getDialog() != null && btScanner.getDialog().isShowing()) {
             startBluetoothDiscovery();
         }
     }