From 1cd588dc650c1c41f720e87628fe33668354dacf Mon Sep 17 00:00:00 2001
From: tianshujie <tianshujie@easycorp.ltd>
Date: Wed, 6 Dec 2023 16:23:10 +0800
Subject: [PATCH] * Fix bug #41114.

---
 module/execution/model.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/module/execution/model.php b/module/execution/model.php
index 2f36d96eec..295526e6fb 100755
--- a/module/execution/model.php
+++ b/module/execution/model.php
@@ -1243,8 +1243,8 @@ class executionModel extends model
         {
             $this->app->loadLang('programplan');
             $parent = $this->getByID($parentID);
-            if($begin < $parent->begin) dao::$errors['begin'] = sprintf($this->lang->programplan->error->letterParent, $parent->begin);
-            if($end > $parent->end)     dao::$errors['end']   = sprintf($this->lang->programplan->error->greaterParent, $parent->end);
+            if($parent && $begin < $parent->begin) dao::$errors['begin'] = sprintf($this->lang->programplan->error->letterParent, $parent->begin);
+            if($parent && $end > $parent->end)     dao::$errors['end']   = sprintf($this->lang->programplan->error->greaterParent, $parent->end);
         }
     }