diff --git a/controllers/admin/AdminThemesController.php b/controllers/admin/AdminThemesController.php
index df1f46d29..0a6046a13 100644
--- a/controllers/admin/AdminThemesController.php
+++ b/controllers/admin/AdminThemesController.php
@@ -677,6 +677,8 @@ class AdminThemesControllerCore extends AdminController
 
         if (!count($this->errors)) {
             Tools::redirectAdmin(Context::getContext()->link->getAdminLink('AdminThemes').'&conf=6');
+        } else {
+            $this->redirect_after = '';
         }
     }
 
@@ -1981,7 +1983,7 @@ class AdminThemesControllerCore extends AdminController
             }
         }
         if ($xml_version_too_old && !$this->_checkConfigForFeatures(array_keys(AdminThemes::$check_features))) {
-            $this->errors[] .= Tools::displayError('The config.xml file has not been created for this version of PrestaShop.');
+            $this->errors[] = Tools::displayError('The config.xml file has not been created for this version of PrestaShop.');
             $return = false;
         }