diff --git a/backup/backup_check.html b/backup/backup_check.html
index a4977d88565..8b26f7ab13f 100644
--- a/backup/backup_check.html
+++ b/backup/backup_check.html
@@ -114,6 +114,7 @@
         $backupprefs->backup_user_files = 0;
         $backupprefs->backup_logs = 0;
         $backupprefs->backup_messages = 0;
+        $backupprefs->backuproleassignments = array();
 
         print_simple_box("<font color=\"red\">".get_string("backupnoneusersinfo")."</font>","center", "70%", '', "20", "noticebox");
         echo "<hr />";