Fixed issue #1001

Author: sergeyklay

bootstrap/autoload.php

@@ -100,7 +100,7 @@
 /**
  * @const ADMIN_LTE_VERSION The AdminLTE version.
  */
-define('ADMIN_LTE_VERSION', '2.3.6');
+defined('ADMIN_LTE_VERSION') || define('ADMIN_LTE_VERSION', '2.3.6');
 
 /** @const COMPATIBLE_VERSION The compatible Phalcon version. */
 define('COMPATIBLE_VERSION', 3000040);