diff --git a/autogpt_platform/backend/backend/copilot/sdk/service.py b/autogpt_platform/backend/backend/copilot/sdk/service.py
index 9c1b05198e..dc91cac3f8 100644
--- a/autogpt_platform/backend/backend/copilot/sdk/service.py
+++ b/autogpt_platform/backend/backend/copilot/sdk/service.py
@@ -439,12 +439,16 @@ async def stream_chat_completion_sdk(
             f"Session {session_id} not found. Please create a new session first."
         )
 
-    if message:
-        session.messages.append(
-            ChatMessage(
-                role="user" if is_user_message else "assistant", content=message
-            )
+    # Append the new message to the session if it's not already there
+    new_message_role = "user" if is_user_message else "assistant"
+    if message and (
+        len(session.messages) == 0
+        or not (
+            session.messages[-1].role == new_message_role
+            and session.messages[-1].content == message
         )
+    ):
+        session.messages.append(ChatMessage(role=new_message_role, content=message))
         if is_user_message:
             track_user_message(
                 user_id=user_id, session_id=session_id, message_length=len(message)
diff --git a/autogpt_platform/backend/backend/copilot/service.py b/autogpt_platform/backend/backend/copilot/service.py
index 022c9063b5..0afc2aa125 100644
--- a/autogpt_platform/backend/backend/copilot/service.py
+++ b/autogpt_platform/backend/backend/copilot/service.py
@@ -428,12 +428,16 @@ async def stream_chat_completion(
             f"Session {session_id} not found. Please create a new session first."
         )
 
-    if message:
-        session.messages.append(
-            ChatMessage(
-                role="user" if is_user_message else "assistant", content=message
-            )
+    # Append the new message to the session if it's not already there
+    new_message_role = "user" if is_user_message else "assistant"
+    if message and (
+        len(session.messages) == 0
+        or not (
+            session.messages[-1].role == new_message_role
+            and session.messages[-1].content == message
         )
+    ):
+        session.messages.append(ChatMessage(role=new_message_role, content=message))
         logger.info(
             f"Appended message (role={'user' if is_user_message else 'assistant'}), "
             f"new message_count={len(session.messages)}"