diff --git a/controllers/admin/AdminTranslationsController.php b/controllers/admin/AdminTranslationsController.php
index 57ad71856..d5fe4b7db 100644
--- a/controllers/admin/AdminTranslationsController.php
+++ b/controllers/admin/AdminTranslationsController.php
@@ -1221,6 +1221,8 @@ class AdminTranslationsControllerCore extends AdminController
 		// Set the path of selected theme
 		if ($this->theme_selected)
 			define('_PS_THEME_SELECTED_DIR_', _PS_ROOT_DIR_.'/themes/'.$this->theme_selected.'/');
+		else
+			define('_PS_THEME_SELECTED_DIR_', '');
 
 		// Get type of translation
 		if (($type = Tools::getValue('type')) && !is_array($type))