Похожая ситуация только ошибка в другом модуле:
<b>Notice</b>: Undefined index: SERVER_PROTOCOL in <b>/home/s/s4as2018ya/public_html/catalog/controller/error/not_found.php</b> on line <b>11</b><b>Notice</b>: Undefined index: SERVER_PROTOCOL in <b>/home/s/s4as2018ya/public_html/catalog/controller/error/not_found.php</b> on line <b>49</b><b>Warning</b>: Cannot modify header information - headers already sent by (output started at /home/s/s4as2018ya/public_html/admin/import_yml_cron.php:98) in <b>/home/s/s4as2018ya/public_html/system/storage/modification/catalog/view/theme/logancee/template/common/header.tpl</b> on line <b>3</b>
в файле not_found.php:
$this->response->addHeader($this->request->server['SERVER_PROTOCOL'] . ' 404 Not Found');
