diff --git a/litellm/llms/anthropic/experimental_pass_through/responses_adapters/transformation.py b/litellm/llms/anthropic/experimental_pass_through/responses_adapters/transformation.py
index 0b38123e787..6d47d0de19f 100644
--- a/litellm/llms/anthropic/experimental_pass_through/responses_adapters/transformation.py
+++ b/litellm/llms/anthropic/experimental_pass_through/responses_adapters/transformation.py
@@ -111,7 +111,7 @@ class LiteLLMAnthropicToResponsesAPIAdapter:
         if isinstance(part, Mapping):
             mapping: Final = cast(Mapping[str, Any], part)  # cast-ok: summary parts are untyped provider json
             return str(mapping.get("text") or "")
-        return str(getattr(part, "text", "") or "")
+        return str(getattr(part, "text", None) or "")
 
     @classmethod
     def _thinking_blocks_from_reasoning_item(