// Filter duplicate URL parameters
        $currentAbsoluteUrl = JUri::getInstance()->toString();
        if (strpos($currentAbsoluteUrl, '?') !== false) {
            $currentAbsoluteUrl = str_replace('??', '?', $currentAbsoluteUrl);
            $urlQuery = parse_url($currentAbsoluteUrl, PHP_URL_QUERY);
            if (strpos($urlQuery, '&') !== false) {
                $urlParams = explode('&', $urlQuery);
                $currentParamCount = count($urlParams);
                $filteredUrlParams = array_unique($urlParams);
                $newFilteredUrlParams = array();
                foreach ($filteredUrlParams as $filteredUrlParam) {
                    if (strpos($filteredUrlParam, '=') !== 0) {
                        $newFilteredUrlParams[] = $filteredUrlParam;
                    }
                }
                sort($newFilteredUrlParams);
                $filteredUrlParams = $newFilteredUrlParams;
                $newParamCount = count($filteredUrlParams);
                if ($newParamCount < $currentParamCount) {
                    $newUrlQuery = implode('&', $filteredUrlParams);
                    $newAbsoluteUrl = str_replace($urlQuery, $newUrlQuery, $currentAbsoluteUrl);
                    $app->redirect($newAbsoluteUrl, 301);
                }
            }
        }