* Fix transaction for upgrade.

lib/dbh/dbh.class.php

@@ -665,6 +665,17 @@ class dbh
         return $this->pdo->beginTransaction();
     }
 
+    /**
+     * Check in transaction or not.
+     *
+     * @access public
+     * @return bool
+     */
+    public function inTransaction()
+    {
+        return $this->pdo->inTransaction();
+    }
+
     /**
      * Roll back if transaction failed.
      *

module/upgrade/control.php

@@ -167,7 +167,7 @@ class upgrade extends control
         if(!$this->upgrade->isError())
         {
             $this->loadModel('setting')->updateVersion($this->config->version);
-            $this->dao->commit();
+            if($this->dao->inTransaction()) $this->dao->commit();
 
             $systemMode = $this->setting->getItem('owner=system&module=common&section=global&key=mode');