" GTM no-script code not found: both lacking or not in " I try to incorporate the script while in the header.tpl but there's no segment. Update: Issue was solved. I just use A different addon and customize hook to do it. Many thanks Ali Edited November 21, 2018 by https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/30904-automatische-hreflang-tags-und-kanonische-tags-seo.html