diff --git a/litellm/proxy/common_utils/responses_stream_errors.py b/litellm/proxy/common_utils/responses_stream_errors.py
index 2bb17281f3d..5582e985d4b 100644
--- a/litellm/proxy/common_utils/responses_stream_errors.py
+++ b/litellm/proxy/common_utils/responses_stream_errors.py
@@ -141,10 +141,13 @@ def _is_plain_json(chunk: object) -> bool:
     return next((not level.values for level in levels if _settles(level)), False)
 
 
+def _carries_a_type(chunk: object) -> bool:
+    return _is_dict(chunk) and type(chunk) is dict and "type" in chunk
+
+
 def responses_chunk_data(chunk: object) -> str | None:
-    kind: Final = type(chunk)
     try:
-        return json.dumps(chunk, allow_nan=False) if kind is dict and _is_plain_json(chunk) else None
+        return json.dumps(chunk, allow_nan=False) if _carries_a_type(chunk) and _is_plain_json(chunk) else None
     except (ValueError, RecursionError):
         return None
 
diff --git a/tests/unit/proxy/proxy_server/test_streaming_helpers.py b/tests/unit/proxy/proxy_server/test_streaming_helpers.py
index ec09b1d4b28..6e081d2c73c 100644
--- a/tests/unit/proxy/proxy_server/test_streaming_helpers.py
+++ b/tests/unit/proxy/proxy_server/test_streaming_helpers.py
@@ -335,6 +335,12 @@ def test_responses_sse_chunk_that_json_cannot_show_as_printed_keeps_the_base_fra
     assert _format_responses_sse_chunk(chunk=chunk) == _format_streaming_sse_chunk(chunk=chunk)
 
 
+def test_responses_sse_chunk_without_a_type_keeps_the_base_frame() -> None:
+    chunk: Final = {"note": "hook output without a type"}
+
+    assert _format_responses_sse_chunk(chunk=chunk) == _format_streaming_sse_chunk(chunk=chunk)
+
+
 def test_responses_error_event_encodes_its_detail_the_way_the_chat_error_frame_does() -> None:
     error: Final = {
         "message": "blocked",