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be/app/Models/SubTask.php

@@ -65,6 +65,9 @@ class SubTask extends Model
 
     public function syncTimeblocks(Array $timeblocks)
     {
+        if (empty($timeblocks)) {
+            return $this->timeblocks()->delete();
+        }
         // pripravenie array na upsert
         $timeblocks = array_map(function($item) {
             $item['sub_task_id'] = $this->id;