In additon to elisolution's answer over, this also checks whether or not we are actually on the home web site (not just whether or not the canonical was set or not). I tested this Alternative a little and as far as I can see, it really works as expected. Or else, https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html