Warning: Undefined array key ….

  • Please HELP!

    I got these error, not knowing what I’ve done wrong! This shows up on top of every product page! How do I fix it???
    “Warning: Undefined array key “last_modified” in?/var/www/vhosts/utoms.se/httpdocs/wp-content/plugins/wp-optimize/minify/class-wp-optimize-minify-front-end.php?on line?1408

    Warning: Undefined array key “last_modified” in?/var/www/vhosts/utoms.se/httpdocs/wp-content/plugins/wp-optimize/minify/class-wp-optimize-minify-front-end.php?on line?1408“

    The page I need help with: [log in to see the link]

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