diff --git a/backend/server.py b/backend/server.py
index c8a5d0c..8db1c8e 100644
--- a/backend/server.py
+++ b/backend/server.py
@@ -246,10 +246,14 @@ class Server:
                 try:
                     preview = await self.config.transcode_tools.processing_preview(file, None, "webp")
                     headers = {}
-                    headers.update({"Content-Length":str(os.path.getsize(preview))})
+                    try:
+                        headers.update({"Content-Length":str(os.path.getsize(preview))})
+                    except:
+                        raise NeedNVR
+
                     headers.update({"Content-Disposition": f'attachment; filename="preview.webp"'})
                     return FileResponse(preview, media_type="application/octet-stream", headers=headers)
-                except NeedNVR | FileNotFoundError:
+                except NeedNVR:
                     background_tasks.add_task(loadPreview, file = file)
                     return FileResponse("./assets/loading.webp")
 
diff --git a/frontend/ang_dvrip/package.json b/frontend/ang_dvrip/package.json
index 8f51f23..7286637 100644
--- a/frontend/ang_dvrip/package.json
+++ b/frontend/ang_dvrip/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ang-dvrip",
-  "version": "0.0.0",
+  "version": "2.2.8a",
   "scripts": {
     "ng": "ng",
     "start": "ng serve",