Undefined array key “nonce”

  • Some pages or custom post types show a blank screen, the cache must be renewed for that page. In the WP errorlog then the PHP warning shows up:

    [03-Mar-2025 11:43:15 UTC] PHP Warning: Undefined array key “nonce” in /******/wp-content/plugins/swift-performance-lite/includes/promo/promo.php on line 29

    We cannot find out the circumstances when the cache works for the mayority of pages and custom post types, and when/why the page or CPT ist just blank.

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