rtimmer

I am having the same issue and I am not using Rankmath.

Main config:

• WooCommerce: 4.9.1
• WordPress: 5.6
• PHP: 7.4.0
• Elementor: 3.0.16
• Yoast Duplicate Post: 4.0.2

Messages
Warning: array_key_exists(): The first argument should be either a string or an integer in …/plugins/duplicate-post/src/ui/class-post-list.php on line 109
Warning: Illegal offset type in …/plugins/duplicate-post/src/ui/class-post-list.php on line 113

Notice: wpdb::prepare was called incorrectly. Unsupported value type (array).

Warning: Illegal offset type in …/plugins/duplicate-post/src/ui/class-post-list.php on line 127

Warning: Illegal offset type in …/plugins/duplicate-post/src/ui/class-post-list.php on line 130

Warning: array_keys() expects parameter 1 to be array, null given in …/plugins/duplicate-post/src/ui/class-post-list.php on line 63

Warning: array_merge(): Expected parameter 2 to be an array, null given in …/plugins/duplicate-post/src/ui/class-post-list.php on line 63

Warning: array_key_exists(): The first argument should be either a string or an integer in …/plugins/duplicate-post/src/ui/class-post-list.php on line 109

Warning: Illegal offset type in …/plugins/duplicate-post/src/ui/class-post-list.php on line 113

I just realized that I didn’t mention the impact well enough. After quick editing a post or a product the whole user interface gets messed up which is unacceptable. After 1 month there is no single response: I will remove this plugin and look for an alternative solution.

I have the same issue.

• WordPress 5.3.2

• Site Language: Dutch (nl_NL)
• User Language: English (en_US)

• WooCommerce 3.9.2
• PHP 7.4.0
• Kadence WooCommerce Email Designer 1.3.13