diff --git a/app/src/main/java/org/linphone/activities/voip/viewmodels/CallsViewModel.kt b/app/src/main/java/org/linphone/activities/voip/viewmodels/CallsViewModel.kt
index 20439c445..d12d0ce90 100644
--- a/app/src/main/java/org/linphone/activities/voip/viewmodels/CallsViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/voip/viewmodels/CallsViewModel.kt
@@ -180,8 +180,14 @@ class CallsViewModel : ViewModel() {
             return
         }
 
-        val micMuted = currentCallData.value?.call?.microphoneMuted ?: false
-        currentCallData.value?.call?.microphoneMuted = !micMuted
+        val call = currentCallData.value?.call
+        if (call != null && call.conference != null) {
+            val micMuted = call.conference?.microphoneMuted ?: false
+            call.conference?.microphoneMuted = !micMuted
+        } else {
+            val micMuted = call?.microphoneMuted ?: false
+            call?.microphoneMuted = !micMuted
+        }
         updateMicState()
     }