diff --git a/rag/llm/chat_model.py b/rag/llm/chat_model.py
index d31587e33c..b8a4a5a0de 100644
--- a/rag/llm/chat_model.py
+++ b/rag/llm/chat_model.py
@@ -301,7 +301,7 @@ class Base(ABC):
                 "role": "assistant",
                 "tool_calls": [
                     {
-                        "index": tool_call.index,
+                        "index": getattr(tool_call, "index", None),
                         "id": tool_call.id,
                         "function": {
                             "name": tool_call.function.name,
@@ -325,18 +325,20 @@ class Base(ABC):
         one assistant message containing all tool_calls, followed by one tool message per call.
         results: list of (tool_call, name, args, result, error)
         """
-        hist.append({
-            "role": "assistant",
-            "tool_calls": [
-                {
-                    "index": tc.index,
-                    "id": tc.id,
-                    "function": {"name": tc.function.name, "arguments": tc.function.arguments},
-                    "type": "function",
-                }
-                for tc, _, _, _, _ in results
-            ],
-        })
+        hist.append(
+            {
+                "role": "assistant",
+                "tool_calls": [
+                    {
+                        "index": getattr(tc, "index", None),
+                        "id": tc.id,
+                        "function": {"name": tc.function.name, "arguments": tc.function.arguments},
+                        "type": "function",
+                    }
+                    for tc, _, _, _, _ in results
+                ],
+            }
+        )
         for tc, _, _, result, err in results:
             if err:
                 content = str(err)
@@ -1474,7 +1476,7 @@ class LiteLLMBase(ABC):
             "role": "assistant",
             "tool_calls": [
                 {
-                    "index": tool_call.index,
+                    "index": getattr(tool_call, "index", None),
                     "id": tool_call.id,
                     "function": {
                         "name": tool_call.function.name,
@@ -1504,7 +1506,7 @@ class LiteLLMBase(ABC):
             "role": "assistant",
             "tool_calls": [
                 {
-                    "index": tc.index,
+                    "index": getattr(tc, "index", None),
                     "id": tc.id,
                     "function": {"name": tc.function.name, "arguments": tc.function.arguments},
                     "type": "function",
@@ -1850,17 +1852,19 @@ class LiteLLMBase(ABC):
             completion_args["extra_headers"] = extra_headers
         return completion_args
 
+
 class RAGconChat(Base):
     """
     RAGcon Chat Provider - routes through LiteLLM proxy
-    
+
     All model types are handled through a unified LiteLLM endpoint.
     Default Base URL: https://connect.ragcon.com/v1
     """
+
     _FACTORY_NAME = "RAGcon"
-    
+
     def __init__(self, key, model_name, base_url=None, **kwargs):
         if not base_url:
             base_url = "https://connect.ragcon.com/v1"
-        
+
         super().__init__(key, model_name, base_url, **kwargs)