How to remake all blank pages on 404 pages?

-- HikaShop version -- : 2.3.4

Hello! How to remake all blank pages with message "Product not found" on 404 pages? Because Joomla redirect component does not work with standard redirect, he is work only for 404 pages.

P.S. I can add the rule in .htaccess for redirect, but this blank pages are indexed by search engines and I can not find all this pages

Hi,

Change the line:
$app->enqueueMessage(JText::_('PRODUCT_NOT_FOUND'));

to:
return JError::raiseError(404, 'product not found');

in the "show" file of the "product" view of your front-end template, via "Hikashop->Display->Views"