diff --git a/app/src/main/java/org/linphone/activities/main/settings/viewmodels/AudioSettingsViewModel.kt b/app/src/main/java/org/linphone/activities/main/settings/viewmodels/AudioSettingsViewModel.kt
index 8c684ef7d..bc269e819 100644
--- a/app/src/main/java/org/linphone/activities/main/settings/viewmodels/AudioSettingsViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/main/settings/viewmodels/AudioSettingsViewModel.kt
@@ -222,7 +222,7 @@ class AudioSettingsViewModel : GenericSettingsViewModel() {
             if (audioDevice.hasCapability(AudioDevice.Capabilities.CapabilityRecord)) {
                 labels.add(audioDevice.id)
                 values.add(audioDevice)
-                if (audioDevice.id == default.id) {
+                if (audioDevice.id == default?.id) {
                     inputAudioDeviceIndex.value = index
                 }
                 index += 1
@@ -242,7 +242,7 @@ class AudioSettingsViewModel : GenericSettingsViewModel() {
             if (audioDevice.hasCapability(AudioDevice.Capabilities.CapabilityPlay)) {
                 labels.add(audioDevice.id)
                 values.add(audioDevice)
-                if (audioDevice.id == default.id) {
+                if (audioDevice.id == default?.id) {
                     outputAudioDeviceIndex.value = index
                 }
                 index += 1
diff --git a/app/src/main/java/org/linphone/utils/AudioRouteUtils.kt b/app/src/main/java/org/linphone/utils/AudioRouteUtils.kt
index 70e776b52..3a0a60b59 100644
--- a/app/src/main/java/org/linphone/utils/AudioRouteUtils.kt
+++ b/app/src/main/java/org/linphone/utils/AudioRouteUtils.kt
@@ -46,9 +46,9 @@ class AudioRouteUtils {
             else
                 AudioDevice.Capabilities.CapabilityRecord
             val preferredDriver = if (output) {
-                coreContext.core.defaultOutputAudioDevice.driverName
+                coreContext.core.defaultOutputAudioDevice?.driverName
             } else {
-                coreContext.core.defaultInputAudioDevice.driverName
+                coreContext.core.defaultInputAudioDevice?.driverName
             }
 
             val extendedAudioDevices = coreContext.core.extendedAudioDevices