php warning

We are sorry to hear that you’re having trouble with our plugin. We can imagine how that could be frustrating for you.

Can you please try the given solution here to see whether this resolves the issue for you?

We look forward to hearing from you.

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

@rtimmer @mredodos

These errors are part of a bug. A fix is ready and will be released in v4.1 of Duplicate Post. We are not sure when it will be released only that a fix is expected to be a part of it.

In the meantime, we suggest signing up for our newsletter as that is where we will announce product changes and updates. You may sign-up for it here https://yoast.com/ by scrolling towards the bottom to complete the sign-up field.