diff --git a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt
index 9706e116..54ac8c52 100644
--- a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt
@@ -485,8 +485,7 @@ class ChatMessageAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
 
     override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
         super.onAttachedToRecyclerView(recyclerView)
-        // RecyclerView와 연결된 시점에 안정 ID 활성화 (JVM 테스트에서 NPE 회피)
-        setHasStableIds(true)
+        // 안정 ID는 어댑터 생성 시(init) 고정됨. 여기서는 연결 상태 플래그만 설정.
         isRecyclerViewAttached = true
     }
 
diff --git a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt
index 8ed0ef70..818eed33 100644
--- a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt
@@ -123,6 +123,8 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
         binding.rvMessages.layoutManager = layoutManager
 
         chatAdapter = ChatMessageAdapter().apply {
+            // RecyclerView에 연결하기 전에 안정 ID를 활성화해야 함
+            setHasStableIds(true)
             setCallback(object : ChatMessageAdapter.Callback {
                 override fun onRetrySend(localId: String) {
                     onRetrySendClicked(localId)