diff --git a/module/task/model.php b/module/task/model.php
index c6ada72304..18476732ad 100755
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -3007,6 +3007,7 @@ class taskModel extends model
      */
     public function updateParent(object $task, bool $isParentChanged): void
     {
+        $task->parent = (int)$task->parent;
         $parentTask = $this->fetchByID($task->parent);
 
         $this->dao->update(TABLE_TASK)->set('parent')->eq(-1)->where('id')->eq($task->parent)->exec();