Uncaught TypeError: array_key_exists()

Just got this error message from WordPress during configuring a plugin:
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WordPress versie 6.8.3
Active theme: Newspaper (versie 12.7.1)
Current plugin: tagDiv Opt-In Builder (versie 1.7.1 | built on 29.04.2025 10:50)
PHP version 8.3.26

Error Details
=============
An error type E_ERROR was caused in linenumber 3276 of file /var/www/vhosts/xxx.xxx/httpdocs/wp-content/plugins/td-subscription/includes/td_subscription.php.
Message: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /var/www/vhosts/xxx.xxx/httpdocs/wp-content/plugins/td-subscription/includes/td_subscription.php:3276
Stack trace:
#0 /var/www/vhosts/xxx.xxx/httpdocs/wp-includes/class-wp-hook.php(324): td_subscription::td_post_theme_settings_mb_save_filter()
#1 /var/www/vhosts/xxx.xxx/httpdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#2 /var/www/vhosts/xxx.xxx/httpdocs/wp-content/plugins/td-composer/legacy/common/wp_booster/wp-admin/external/wpalchemy/MetaBox.php(880): apply_filters()
#3 /var/www/vhosts/xxx.xxx/httpdocs/wp-content/plugins/td-composer/legacy/common/wp_booster/wp-admin/external/wpalchemy/MetaBox.php(2081): WPAlchemy_MetaBox->apply_filters()
#4 /var/www/vhosts/xxx.xxx/httpdocs/wp-includes/class-wp-hook.php(326): WPAlchemy_MetaBox->_save()
#5 /var/www/vhosts/xxx.xxx/httpdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#6 /var/www/vhosts/xxx.xxx/httpdocs/wp-includes/plugin.php(517): WP_Hook->do_action()
#7 /var/www/vhosts/xxx.xxx/httpdocs/wp-includes/post.php(5110): do_action()
#8 /var/www/vhosts/xxx.xxx/httpdocs/wp-includes/post.php(5212): wp_insert_post()
#9 /var/www/vhosts/xxx.xxx/httpdocs/wp-admin/includes/post.php(453): wp_update_post()
#10 /var/www/vhosts/xxx.xxx/httpdocs/wp-admin/post.php(227): edit_post()
#11 {main}
thrown
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Might this be caused by a lack of memory (php,SQL,kernel)?
Thank you,
Jos

• This topic was modified 10 months by DocDigit.