PHP Warnings

  • Hi, I get these warnings in my WordPress Backend:

    Warning: Trying to access array offset on value of type null in ../wp-content/plugins/multisite-toolbar-additions/includes/ddwlib-plir/ddwlib-plugin-installer-recommendations.php on line 346

    Warning: Cannot modify header information – headers already sent by (output started at ../wp-content/plugins/multisite-toolbar-additions/includes/ddwlib-plir/ddwlib-plugin-installer-recommendations.php:346) in ../wp-admin/admin-header.php on line 9

    I use PHP 8.0

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