You specify the first URL as the search engine could have difficulty deciding which one ought to be the key URL.  The following tutorial will tell you about tips on how to enable Canonical URLs in Prestashop 1.5. Meta key terms. Key phrases which you ought to determine as https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html