Undefined index in the web scenario configuration page

An error appears in the web scenario configuration list: "Undefined index: httpTestsLastData [httpconf.php:638 ? CView->render() ? include() in /opt/lampp/htdocs/zabbix/trunk/frontends/php/include/views/configuration.httpconf.list.php:75]"

To reproduce the error set the "Dropdown first entry" option to "None", open the scenario configuration list and set the host group to "not selected".