diff --git a/app/Http/Controllers/CareerController.php b/app/Http/Controllers/CareerController.php
index ea056ac..427e16e 100644
--- a/app/Http/Controllers/CareerController.php
+++ b/app/Http/Controllers/CareerController.php
@@ -395,7 +395,7 @@ class CareerController extends Controller
             ->map(function ($intern) {
                 return [
                     'id' => $intern->id,
-                    'parentId' => 0,
+                    'parentId' => null,
                     'title' => $intern->name,
                     'start' => $intern->internship_start_date,
                     'end' => $intern->internship_end_date,
diff --git a/resources/views/front/career/admin_dashboard.blade.php b/resources/views/front/career/admin_dashboard.blade.php
index f13c9b9..92bc1b5 100644
--- a/resources/views/front/career/admin_dashboard.blade.php
+++ b/resources/views/front/career/admin_dashboard.blade.php
@@ -227,7 +227,7 @@
       
       const formattedData = ganttData.map(intern => ({
         id: intern.id,
-        parentId: 0,
+        parentId: null,
         title: intern.title,
         start: new Date(intern.start),
         end: new Date(intern.end),