diff --git a/typo3/sysext/backend/Classes/Http/AjaxRequestHandler.php b/typo3/sysext/backend/Classes/Http/AjaxRequestHandler.php
index ab791a1aefe29aa30a26fe47a3d6eb43cf2efce1..21035a40f790f9c3c354169f534fdeb27810340d 100644
--- a/typo3/sysext/backend/Classes/Http/AjaxRequestHandler.php
+++ b/typo3/sysext/backend/Classes/Http/AjaxRequestHandler.php
@@ -197,7 +197,7 @@ class AjaxRequestHandler implements RequestHandlerInterface
         } elseif (empty($ajaxScript)) {
             $ajaxObj->setError('No backend function registered for ajaxID "' . $ajaxID . '".');
         } elseif ($csrfTokenCheck && !$this->isValidRequest($request)) {
-            $ajaxObj->setError('Invalid CSRF token detected for ajaxID "' . $ajaxID . '"!');
+            $ajaxObj->setError('Invalid CSRF token detected for ajaxID "' . $ajaxID . '", reload the backend of TYPO3');
         } else {
             $success = GeneralUtility::callUserFunction($ajaxScript, $ajaxParams, $ajaxObj, '', 1);
             if ($success === false) {