In additon to elisolution's reply above, this also checks whether or not we are literally on the home site (not just whether the canonical was established or not). I examined this Remedy a tiny bit and so far as I am able to see, it works as expected. Or else, remember https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html