diff --git a/core/lib/Drupal/Core/Database/Install/Tasks.php b/core/lib/Drupal/Core/Database/Install/Tasks.php
index 8036322..9ac759e 100644
--- a/core/lib/Drupal/Core/Database/Install/Tasks.php
+++ b/core/lib/Drupal/Core/Database/Install/Tasks.php
@@ -151,11 +151,11 @@ public function runTasks() {
     $message = '';
     foreach ($this->results as $result => $success) {
       if (!$success) {
-        $message = SafeMarkup::isSafe($result) ? $result : SafeMarkup::checkPlain($result);
+        $message .= $result;
       }
     }
     if (!empty($message)) {
-      $message = SafeMarkup::set('Resolve all issues below to continue the installation. For help configuring your database server, see the <a href="https://www.drupal.org/getting-started/install">installation handbook</a>, or contact your hosting provider.' . $message);
+      $message = SafeMarkup::format('Resolve all issues below to continue the installation. For help configuring your database server, see the <a href="https://www.drupal.org/getting-started/install">installation handbook</a>, or contact your hosting provider. @message', array('@message' => $message));
       throw new TaskException($message);
     }
   }