diff --git a/module/program/model.php b/module/program/model.php
index 2575f62164..241b941be5 100644
--- a/module/program/model.php
+++ b/module/program/model.php
@@ -353,10 +353,10 @@ class programModel extends model
             ->get();
         $program = $this->loadModel('file')->processImgURL($program, $this->config->program->editor->edit['id'], $this->post->uid);
 
-        if(!empty($program->isCat) and $this->checkHasContent($programID))  dao::$errors['isCat'] = $this->lang->program->cannotChangeToCat;
-        if(empty($program->isCat)  and $this->checkHasChildren($programID)) dao::$errors['isCat'] = $this->lang->program->cannotCancelCat;
+        if(!$oldProgram->isCat and !empty($program->isCat) and $this->checkHasContent($programID))  dao::$errors['isCat'] = $this->lang->program->cannotChangeToCat;
+        if($oldProgram->isCat  and empty($program->isCat)  and $this->checkHasChildren($programID)) dao::$errors['isCat'] = $this->lang->program->cannotCancelCat;
 
-        if($program->isCat)
+        if(!empty($program->isCat))
         {
             $minChildBegin = $this->dao->select('min(begin) as minBegin')->from(TABLE_PROJECT)->where('id')->ne($programID)->andWhere('deleted')->eq(0)->andWhere('path')->like("%,{$programID},%")->fetch('minBegin');
             $maxChildEnd   = $this->dao->select('max(end) as maxEnd')->from(TABLE_PROJECT)->where('id')->ne($programID)->andWhere('deleted')->eq(0)->andWhere('path')->like("%,{$programID},%")->fetch('maxEnd');