diff --git a/nirvana-ios/Models/Message.swift b/nirvana-ios/Models/Message.swift
index 360dc2b..9d45699 100644
--- a/nirvana-ios/Models/Message.swift
+++ b/nirvana-ios/Models/Message.swift
@@ -15,7 +15,7 @@ struct Message: Identifiable, Codable {
     var receiverId: String
     var senderId: String
     var listenCount: Int
-    var audioDataUrl:String?
+    var audioDataUrl:String
     
     @ServerTimestamp var sentTimestamp:Date?
     var firstListenTimestamp:Date?
diff --git a/nirvana-ios/Services/AuthSessionStore.swift b/nirvana-ios/Services/AuthSessionStore.swift
index 3e8dfa9..c040e15 100644
--- a/nirvana-ios/Services/AuthSessionStore.swift
+++ b/nirvana-ios/Services/AuthSessionStore.swift
@@ -312,6 +312,7 @@ extension AuthSessionStore {
                     }
                     return nil
                 }
+                // TODO: maybe need to call object will change here
                 
                 // TODO: optimize later
 //                guard let snapshot = querySnapshot else {