diff --git a/nanobot/providers/custom_provider.py b/nanobot/providers/custom_provider.py
index f190ccf..4022d9e 100644
--- a/nanobot/providers/custom_provider.py
+++ b/nanobot/providers/custom_provider.py
@@ -40,7 +40,7 @@ class CustomProvider(LLMProvider):
         return LLMResponse(
             content=msg.content, tool_calls=tool_calls, finish_reason=choice.finish_reason or "stop",
             usage={"prompt_tokens": u.prompt_tokens, "completion_tokens": u.completion_tokens, "total_tokens": u.total_tokens} if u else {},
-            reasoning_content=getattr(msg, "reasoning_content", None),
+            reasoning_content=getattr(msg, "reasoning_content", None) or None,
         )
 
     def get_default_model(self) -> str:
diff --git a/nanobot/providers/litellm_provider.py b/nanobot/providers/litellm_provider.py
index 58c9ac2..784f02c 100644
--- a/nanobot/providers/litellm_provider.py
+++ b/nanobot/providers/litellm_provider.py
@@ -257,7 +257,7 @@ class LiteLLMProvider(LLMProvider):
                 "total_tokens": response.usage.total_tokens,
             }
         
-        reasoning_content = getattr(message, "reasoning_content", None)
+        reasoning_content = getattr(message, "reasoning_content", None) or None
         
         return LLMResponse(
             content=message.content,