It could be a certain module or plugin producing the error. I'd personally advise re-installing the Prestashop core files if you haven’t already. The choice of adding a security module will count higher than all on your site and what you need to accomplish with it. My issue is is https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html