diff --git a/src/lib/services/preferences.service.ts b/src/lib/services/preferences.service.ts
index 6bc4294..e1aa6c1 100644
--- a/src/lib/services/preferences.service.ts
+++ b/src/lib/services/preferences.service.ts
@@ -27,6 +27,7 @@ export class PreferencesService {
       return {
         ...defaultPreferences,
         ...preferences.toObject(),
+        _id: undefined, //plain object KO on server components hydration
       };
     } catch (error) {
       if (error instanceof AppError) {