diff --git a/litellm/responses/streaming_iterator.py b/litellm/responses/streaming_iterator.py
index da8ff2cd207..58b0f218f71 100644
--- a/litellm/responses/streaming_iterator.py
+++ b/litellm/responses/streaming_iterator.py
@@ -1157,7 +1157,8 @@ class BaseResponsesAPIStreamingIterator:
 
     def _note_yielded_event(self, event: ResponsesAPIStreamingResponse) -> None:
         self._yielded_first_chunk = True
-        if event.type not in PRE_OUTPUT_LIFECYCLE_EVENT_TYPES:
+        event_type: Final[object] = getattr(event, "type", None)
+        if event_type not in PRE_OUTPUT_LIFECYCLE_EVENT_TYPES:
             self._output_started = True
 
     def _fallback_error(self, original: Exception) -> MidStreamFallbackError:
diff --git a/tests/unit/responses/test_streaming_iterator.py b/tests/unit/responses/test_streaming_iterator.py
index 5072f3d3108..b1859ddf33c 100644
--- a/tests/unit/responses/test_streaming_iterator.py
+++ b/tests/unit/responses/test_streaming_iterator.py
@@ -25,6 +25,7 @@ from litellm.integrations.custom_logger import CustomLogger
 from litellm.litellm_core_utils.core_helpers import UPSTREAM_USAGE_COST, billed_usage_cost
 from litellm.litellm_core_utils.litellm_logging import Logging as LiteLLMLoggingObj
 from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfig
+from litellm.llms.openai.responses.transformation import OpenAIResponsesAPIConfig
 from litellm.responses.streaming_iterator import (
     CachedResponsesAPIStreamingIterator,
     MockResponsesAPIStreamingIterator,
@@ -415,6 +416,20 @@ async def test_complete_stream_still_ends_normally(trailer):
     assert logging_obj.async_failure_handler.await_count == 0
 
 
+@pytest.mark.asyncio
+async def test_event_without_a_type_reaches_the_caller_instead_of_ending_the_stream():
+    iterator: Final = _make_iterator(
+        sse_events=[_CREATED_EVENT, _sse_event({"note": "hook output without a type"})],
+        logging_obj=_failure_tracking_logging_obj(),
+        config=OpenAIResponsesAPIConfig(),
+    )
+
+    await iterator.__anext__()
+    untyped: Final = await iterator.__anext__()
+
+    assert untyped.model_extra == {"note": "hook output without a type"}
+
+
 @pytest.mark.parametrize("trailing_error", _TRAILING_ERRORS, ids=type)
 def test_sync_transport_error_before_any_output_raises_fallback_error(trailing_error):
     logging_obj: Final = _failure_tracking_logging_obj()