diff --git a/homeassistant/components/conversation/chat_log.py b/homeassistant/components/conversation/chat_log.py
index 1ee5e9965ab..19482af1983 100644
--- a/homeassistant/components/conversation/chat_log.py
+++ b/homeassistant/components/conversation/chat_log.py
@@ -49,7 +49,11 @@ def async_get_chat_log(
             raise RuntimeError(
                 "Cannot attach chat log delta listener unless initial caller"
             )
-        if user_input is not None:
+        if user_input is not None and (
+            (content := chat_log.content[-1]).role != "user"
+            # MyPy doesn't understand that content is a UserContent here
+            or content.content != user_input.text  # type: ignore[union-attr]
+        ):
             chat_log.async_add_user_content(UserContent(content=user_input.text))
 
         yield chat_log
diff --git a/tests/components/conversation/test_chat_log.py b/tests/components/conversation/test_chat_log.py
index a4dc9b819c1..c0687ebecfb 100644
--- a/tests/components/conversation/test_chat_log.py
+++ b/tests/components/conversation/test_chat_log.py
@@ -86,7 +86,9 @@ async def test_default_content(
     with (
         chat_session.async_get_chat_session(hass) as session,
         async_get_chat_log(hass, session, mock_conversation_input) as chat_log,
+        async_get_chat_log(hass, session, mock_conversation_input) as chat_log2,
     ):
+        assert chat_log is chat_log2
         assert len(chat_log.content) == 2
         assert chat_log.content[0].role == "system"
         assert chat_log.content[0].content == ""