diff --git a/src/routers/deep_agent_chat.py b/src/routers/deep_agent_chat.py
index 99b54a5..3aa139c 100755
--- a/src/routers/deep_agent_chat.py
+++ b/src/routers/deep_agent_chat.py
@@ -268,7 +268,7 @@ async def chat_stream(request: DeepAgentChatRequest):
                     tools_messages = update_tools_messages.get("messages", [])
                     for tools_token in tools_messages:
                         if isinstance(tools_token, ToolMessage):
-                            tool_content_blocks = tools_token.content_blocks[0]
+                            tool_content_blocks = tools_token.content_blocks[0] if tools_token.content_blocks else None
                             tool_name = tools_token.name
                             logger.info(f"[updates] {tool_name} -- {tool_content_blocks}")