It could be a specific module or plugin producing the error. I might recommend re-installing the Prestashop Main files in case you haven’t already. I'm loving the pliability in the PrestaShop API. It's so functional and makes it very easy to integrate with other platforms. To initiate your 1st request, https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html