From 09efe47f17190a59300ace5b5031471de8159169 Mon Sep 17 00:00:00 2001
From: Your Name <your.email@example.com>
Date: Tue, 9 Jun 2026 13:19:56 +0800
Subject: [PATCH] fix(chat): tolerate file part optional data field in
 image-media conversion

---
 app/(chat)/api/chat/_lib/image-media.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/(chat)/api/chat/_lib/image-media.ts b/app/(chat)/api/chat/_lib/image-media.ts
index 91e42e09a..88532221a 100644
--- a/app/(chat)/api/chat/_lib/image-media.ts
+++ b/app/(chat)/api/chat/_lib/image-media.ts
@@ -611,7 +611,7 @@ export async function convertMessagesWithImages(
 
       const candidateImageUrl =
         part.type === "file"
-          ? part.url || part.data
+          ? part.url || (part as { data?: string | undefined }).data
           : part.type === "image"
             ? part.image || part.url
             : part.type === "image_url"