Warning: Undefined array key

  • Resolved Branike

    (@branike)


    2 years, 8 months ago

    Warning: Undefined array key “theme_lists_show” in /wp-content/plugins/newsletter-leads/iframe.php on line 18

    Hi, I get this message from a popup form. I saw it on many sites that have it. Any advice to fix the problem?

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

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