diff --git a/module/project/model.php b/module/project/model.php
index d7ebfe59f8..b5d90b1f05 100644
--- a/module/project/model.php
+++ b/module/project/model.php
@@ -1700,10 +1700,13 @@ class projectModel extends model
             {
                 if(!$oldProject->hasProduct && $oldProject->name != $project->name) $this->updateProductName($project->name, $projectID);
 
-                $linkedProducts = $this->dao->select('product')->from(TABLE_PROJECTPRODUCT)->where('project')->eq($projectID)->fetchPairs();
-                $this->updateProductProgram($oldProject->parent, $project->parent, $linkedProducts);
+                if(isset($project->parent))
+                {
+                    $linkedProducts = $this->dao->select('product')->from(TABLE_PROJECTPRODUCT)->where('project')->eq($projectID)->fetchPairs();
+                    $this->updateProductProgram($oldProject->parent, $project->parent, $linkedProducts);
+                    if($oldProject->parent != $project->parent) $this->loadModel('program')->processNode($projectID, $project->parent, $oldProject->path, $oldProject->grade);
+                }
 
-                if($oldProject->parent != $project->parent) $this->loadModel('program')->processNode($projectID, $project->parent, $oldProject->path, $oldProject->grade);
                 /* When acl is open, white list set empty. When acl is private,update user view. */
                 if($project->acl == 'open') $this->loadModel('personnel')->updateWhitelist(array(), 'project', $projectID);
                 if($project->acl != 'open') $this->loadModel('user')->updateUserView($projectID, 'project');