diff --git a/app/client/platforms/openai.ts b/app/client/platforms/openai.ts
index 664ff872b..349a014ec 100644
--- a/app/client/platforms/openai.ts
+++ b/app/client/platforms/openai.ts
@@ -244,6 +244,7 @@ export class ChatGPTApi implements LLMApi {
         );
       }
       if (shouldStream) {
+        let index = -1;
         const [tools, funcs] = usePluginStore
           .getState()
           .getAsTools(
@@ -269,7 +270,7 @@ export class ChatGPTApi implements LLMApi {
             }>;
             const tool_calls = choices[0]?.delta?.tool_calls;
             if (tool_calls?.length > 0) {
-              const index = tool_calls[0]?.index;
+              index += 1;
               const id = tool_calls[0]?.id;
               const args = tool_calls[0]?.function?.arguments;
               if (id) {
@@ -294,6 +295,8 @@ export class ChatGPTApi implements LLMApi {
             toolCallMessage: any,
             toolCallResult: any[],
           ) => {
+            // reset index value
+            index = -1;
             // @ts-ignore
             requestPayload?.messages?.splice(
               // @ts-ignore