It could be a particular module or plugin leading to the error. I might advise re-installing the Prestashop core files should you haven’t already. That is also for protection reasons, in order to’t use the title admin as a Listing folder identify. You can use some other title although not https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html