diff --git a/be/app/Http/Controllers/SubTaskController.php b/be/app/Http/Controllers/SubTaskController.php
index 0801a1e..35fc9e8 100644
--- a/be/app/Http/Controllers/SubTaskController.php
+++ b/be/app/Http/Controllers/SubTaskController.php
@@ -176,6 +176,9 @@ class SubTaskController extends Controller
 
         // syncnutie timeblocks
         foreach ( $request->all()['data']['employees'] as $key => $employee ) {
+            if (!isset($data['data']['employees'][$key]['timeblocks']) || $data['data']['employees'][$key]['timeblocks'] == null)
+                continue;
+            
             if ($data['data']['employees'][$key]['user_id'] == $employee['id'])
                 $subtasks[$key]->syncTimeblocks($data['data']['employees'][$key]['timeblocks']);
         }