diff --git a/src/app/api/popi/media/upload/route.ts b/src/app/api/popi/media/upload/route.ts
index dc0ced94..b59519d6 100644
--- a/src/app/api/popi/media/upload/route.ts
+++ b/src/app/api/popi/media/upload/route.ts
@@ -65,6 +65,10 @@ function mediaResourceUrl(media: PopiMedia): string | null {
   return media.url || media.originUrl || media.path || media.originPath || null;
 }
 
+function isPopiMedia(value: PopiMediaUploadData): value is PopiMedia {
+  return "url" in value || "originUrl" in value || "path" in value || "originPath" in value;
+}
+
 function uploadedMediaUrls(data: PopiMediaUploadData | undefined): string[] {
   if (!data) return [];
   if (Array.isArray(data)) {
@@ -81,6 +85,7 @@ function uploadedMediaUrls(data: PopiMediaUploadData | undefined): string[] {
   if (list) {
     return list.map(mediaResourceUrl).filter((url): url is string => Boolean(url));
   }
+  if (!isPopiMedia(data)) return [];
   const single = mediaResourceUrl(data);
   return single ? [single] : [];
 }