diff --git a/module/upgrade/model.php b/module/upgrade/model.php
index 78083a4260..88f9f7b32d 100644
--- a/module/upgrade/model.php
+++ b/module/upgrade/model.php
@@ -7967,6 +7967,13 @@ class upgradeModel extends model
         {
             if(!$module || !$name) continue;
 
+            $exist = $this->dao->select('id')->from(TABLE_MODULE)
+                 ->where('root')->eq($dimension)
+                 ->andWhere('collector')->eq($module)
+                 ->andWhere('type')->eq($type)
+                 ->fetchAll();
+            if(!empty($exist)) continue;
+
             $group->name      = $name;
             $group->collector = $module;
             $this->dao->replace(TABLE_MODULE)->data($group)->exec();
@@ -8012,6 +8019,24 @@ class upgradeModel extends model
         return !dao::isError();
     }
 
+    /**
+     * Process pivot modules.
+     *
+     * @param  array  $modules
+     * @access public
+     * @return bool
+     */
+    public function processPivotModules($modules)
+    {
+        foreach($modules as $code => $module)
+        {
+            if(!$code || !$module) continue;
+            $this->dao->update(TABLE_PIVOT)->set("`group` = REPLACE(`group`, '$code', $module)")->exec();
+        }
+
+        return !dao::isError();
+    }
+
     /**
      * Xuan: Set mute and freeze for hidden groups.
      *