Prestashop Error 1.7.8.3 - but previous version as well

[RAzor23]

Hello!

 

I have the following problem.

 

When i put in a tpl the smarty debug using: 

 

{debug} i get the following error: 

 

Type error: Argument 1 passed to PrestaShopBundle\Twig\LayoutExtension::escapeSmarty() must be of the type string, null given, called in /home........public_html/prestadef/src/PrestaShopBundle/Twig/LayoutExtension.php on line 234 which is: 

 

my tpl is simply : 

 The problem goes away if i remove the debug.