diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/scalesJava/BluetoothStandardWeightProfile.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/scalesJava/BluetoothStandardWeightProfile.java
index 20a77844..bcbaa67e 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/scalesJava/BluetoothStandardWeightProfile.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/scalesJava/BluetoothStandardWeightProfile.java
@@ -853,6 +853,42 @@ public abstract class BluetoothStandardWeightProfile extends BluetoothCommunicat
             choiceStrings[userList.size()] = context.getString(R.string.bluetooth_scale_info_create_user_instruction);
             indexArray[userList.size()] = -1;
         }
+
+        if (choiceStrings != null && indexArray != null) {
+            StringBuilder logMessage = new StringBuilder("Preparing CHOOSE_USER interaction. ");
+            logMessage.append("choiceStrings (length: ").append(choiceStrings.length).append("): [");
+            for (int i = 0; i < choiceStrings.length; i++) {
+                logMessage.append("'").append(choiceStrings[i]).append("'");
+                if (i < choiceStrings.length - 1) {
+                    logMessage.append(", ");
+                }
+            }
+            logMessage.append("]. ");
+
+            logMessage.append("indexArray (length: ").append(indexArray.length).append("): [");
+            for (int i = 0; i < indexArray.length; i++) {
+                logMessage.append(indexArray[i]);
+                if (i < indexArray.length - 1) {
+                    logMessage.append(", ");
+                }
+            }
+            logMessage.append("].");
+            LogManager.d(TAG, logMessage.toString());
+
+            // Check for potential issues that might lead to UI errors
+            if (choiceStrings.length != indexArray.length) {
+                LogManager.w(TAG, "CHOOSE_USER: Mismatch in lengths: choiceStrings (" + choiceStrings.length +
+                        ") vs indexArray (" + indexArray.length + ").", null);
+            }
+            if (choiceStrings.length == 0) {
+                LogManager.w(TAG, "CHOOSE_USER: choiceStrings array is empty. No options will be presented to the user.", null);
+            }
+
+        } else {
+            // This is a critical error state if either array is null
+            LogManager.e(TAG, "CHOOSE_USER: choiceStrings or indexArray is null. Cannot request user interaction.", null);
+        }
+
         Pair<CharSequence[], int[]> choices = new Pair(choiceStrings, indexArray);
         requestUserInteraction(UserInteractionType.CHOOSE_USER, choices);
     }
diff --git a/android_app/app/src/main/java/com/health/openscale/ui/navigation/AppNavigation.kt b/android_app/app/src/main/java/com/health/openscale/ui/navigation/AppNavigation.kt
index c41f6927..1c6f5296 100644
--- a/android_app/app/src/main/java/com/health/openscale/ui/navigation/AppNavigation.kt
+++ b/android_app/app/src/main/java/com/health/openscale/ui/navigation/AppNavigation.kt
@@ -19,6 +19,8 @@ package com.health.openscale.ui.navigation
 
 import android.app.Application
 import android.content.res.Resources
+import android.net.http.SslCertificate.restoreState
+import android.net.http.SslCertificate.saveState
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
@@ -108,6 +110,7 @@ import com.health.openscale.R
 import com.health.openscale.core.bluetooth.BluetoothEvent.UserInteractionType
 import com.health.openscale.core.bluetooth.scalesJava.BluetoothCommunication
 import com.health.openscale.core.data.User
+import com.health.openscale.core.utils.LogManager
 import com.health.openscale.ui.navigation.Routes.getIconForRoute
 import com.health.openscale.ui.screen.SharedViewModel
 import com.health.openscale.ui.screen.bluetooth.BluetoothViewModel
@@ -146,6 +149,7 @@ import kotlinx.coroutines.launch
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun AppNavigation(sharedViewModel: SharedViewModel) {
+    val TAG = "AppNavigation"
     val context = LocalContext.current
     val resources = context.resources // Get resources for non-composable string access
     val application = context.applicationContext as Application
@@ -294,13 +298,18 @@ fun AppNavigation(sharedViewModel: SharedViewModel) {
                     when (interactionEvent.interactionType) {
                         UserInteractionType.CHOOSE_USER -> {
                             val choicesData = interactionEvent.data
-                            // Wir erwarten Pair<Array<String>, IntArray> oder Pair<Array<CharSequence>, IntArray>
+                            LogManager.d(TAG, "CHOOSE_USER interaction received. Data: $choicesData")
+
+                            // Expecting Pair<Array<String>, IntArray> or Pair<Array<CharSequence>, IntArray>
                             if (choicesData is Pair<*, *> && choicesData.first is Array<*> && choicesData.second is IntArray) {
                                 @Suppress("UNCHECKED_CAST")
                                 val choices = choicesData as Pair<Array<CharSequence>, IntArray>
                                 val choiceDisplayNames = choices.first
                                 val choiceIndices = choices.second
 
+                                LogManager.d(TAG, "CHOOSE_USER: DisplayNames (length ${choiceDisplayNames.size}): ${choiceDisplayNames.joinToString { "'$it'" }}")
+                                LogManager.d(TAG, "CHOOSE_USER: Indices (length ${choiceIndices.size}): ${choiceIndices.joinToString()}")
+
                                 if (choiceDisplayNames.isNotEmpty() && choiceDisplayNames.size == choiceIndices.size) {
                                     LazyColumn(modifier = Modifier.padding(top = 8.dp)) {
                                         itemsIndexed(choiceDisplayNames) { itemIndex, choiceName ->
@@ -309,7 +318,10 @@ fun AppNavigation(sharedViewModel: SharedViewModel) {
                                                     .fillMaxWidth()
                                                     .selectable(
                                                         selected = (choiceIndices[itemIndex] == selectedUserIndexState),
-                                                        onClick = { selectedUserIndexState = choiceIndices[itemIndex] }
+                                                        onClick = {
+                                                            selectedUserIndexState =
+                                                                choiceIndices[itemIndex]
+                                                        }
                                                     )
                                                     .padding(vertical = 8.dp),
                                                 verticalAlignment = Alignment.CenterVertically