error when upgrading php version

  • Hello,
    I’ve update WP 5.7.8 to latest 6.1.1, Munk Theme 1.0.9 to 2.0.7, Elementor 2.9.14 to 3.9.2 without any problem. BUT whan I update php version from 7.4 to 8.x I see this error:

    Warning: Trying to access array offset on value of type null in /web/htdocs/www[............]/wp-content/plugins/header-footer-composer/includes/class-header-footer-composer-render.php on line 121

    How can it be solved?

    thanks,
    Nicola

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