diff --git a/app/api/chat/route.ts b/app/api/chat/route.ts
index ec1ce73..5500723 100644
--- a/app/api/chat/route.ts
+++ b/app/api/chat/route.ts
@@ -4,20 +4,21 @@ import { Configuration, OpenAIApi } from 'openai-edge'
 
 import { auth } from '@/auth'
 import { nanoid } from '@/lib/utils'
+import { Session } from 'inspector'
 
 export const runtime = 'edge'
 
 export async function POST(req: Request) {
+  const json = await req.json()
+  const { messages, previewToken } = json
+  let session: Session
   if (process.env.VERCEL_ENV !== 'preview') {
-    const session = await auth()
+    session = await auth()
     if (session == null) {
       return new Response('Unauthorized', { status: 401 })
     }
   }
 
-  const json = await req.json()
-  const { messages, previewToken } = json
-
   const configuration = new Configuration({
     apiKey: previewToken || process.env.OPENAI_API_KEY
   })