diff --git a/app/[locale]/join/page.tsx b/app/[locale]/join/page.tsx
index 8b0ff88..e7f5e08 100644
--- a/app/[locale]/join/page.tsx
+++ b/app/[locale]/join/page.tsx
@@ -456,10 +456,11 @@ export default function JoinPage() {
                     "/api/upload-media",
                     { method: "POST", body: fd }
                   );
-                  if (!data?.ok) {
+                  if (!data?.ok || !data.url) {
                     throw new Error(data?.error || "上传失败");
                   }
-                  setMedia((m) => (m ? { ...m, url: data.url } : null));
+                  const uploadedUrl = data.url;
+                  setMedia((m) => (m ? { ...m, url: uploadedUrl } : null));
                 } catch (err) {
                   alert(err instanceof Error ? err.message : "上传失败");
                   URL.revokeObjectURL(preview);