Prestashop Local site blank

[someone123]

I get this error on my prestashop local site connecting to port 443:

Does anyone know how to solv it? Thank you.

 

Warning: Header may not contain more than a single header, new line detected in /var/www/html/useragency/classes/Tools.php on line 177

[Mehdi Bourechka]

On 8/17/2025 at 10:39 AM, someone123 said:

I get this error on my prestashop local site connecting to port 443:

Does anyone know how to solv it? Thank you.

 

Warning: Header may not contain more than a single header, new line detected in /var/www/html/useragency/classes/Tools.php on line 177

White page on local site = PHP error.

First, enable debug mode (define('_PS_MODE_DEV_', true) in config/defines.inc.php) so the real error appears.

Then check:

PHP memory limit (memory_limit)

File/folder permissions (755 / 644)

Clear cache folders (var/cache)

ps_shop_url values if you migrated the site

If any of these are wrong, PrestaShop will show a blank page without any message.