diff --git a/apps/api-service/src/services/MinioStorageService.ts b/apps/api-service/src/services/MinioStorageService.ts
index eaec2cf..a40225d 100644
--- a/apps/api-service/src/services/MinioStorageService.ts
+++ b/apps/api-service/src/services/MinioStorageService.ts
@@ -456,7 +456,7 @@ export class MinioStorageService implements StorageService {
             size: obj.size,
             contentType,
             lastModified: obj.lastModified || new Date(),
-            etag: obj.etag,
+            etag: obj.etag || '',
             path: obj.name,
           });
         } catch (error) {