diff --git a/app/client/platforms/openai.ts b/app/client/platforms/openai.ts
index 095416645..5a4b2b069 100644
--- a/app/client/platforms/openai.ts
+++ b/app/client/platforms/openai.ts
@@ -162,7 +162,7 @@ export class ChatGPTApi implements LLMApi {
             const text = msg.data;
             try {
               const json = JSON.parse(text);
-              const delta = json.choices[0].delta.content;
+              const delta = json.choices[0]?.delta.content;
               if (delta) {
                 responseText += delta;
                 options.onUpdate?.(responseText, delta);