diff --git a/letta/llm_api/llm_api_tools.py b/letta/llm_api/llm_api_tools.py
index f489b873..fe941e03 100644
--- a/letta/llm_api/llm_api_tools.py
+++ b/letta/llm_api/llm_api_tools.py
@@ -340,7 +340,7 @@ def create(
                 tool_choice = {"type": "any", "disable_parallel_tool_use": True}
             else:
                 tool_choice = {"type": "auto", "disable_parallel_tool_use": True}
-            tools = [{"type": "function", "function": f} for f in functions]
+            tools = [{"type": "function", "function": f} for f in functions] if functions is not None else None
 
         chat_completion_request = ChatCompletionRequest(
             model=llm_config.model,