In additon to elisolution's remedy previously mentioned, this also checks no matter whether we are literally on the house page (not only whether the canonical was established or not). I tested this solution a little bit and as far as I can see, it really works as anticipated. Otherwise, you should https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html