NULL value of duplicate_post_taxonomies_blacklist is not processed correctly

[aleks-lynx]

Hi,

I found that "duplicate_post_taxonomies_blacklist" can be NULL sometimes, but the code expects an empty string only.

// duplicate-post/admin-functions.php:287
if ( $taxonomies_blacklist === '' ) {
    $taxonomies_blacklist = [];
}

NULL should be checked here as well, by using empty() for example.

Original post in the support forum:
https://wordpress.org/support/topic/taxonomies-are-not-copied-because-duplicate_post_taxonomies_blacklist-is-null/

We're using version 4.5 of the plugin at the moment.

[michael-sumner]

Hey @aleks-lynx

Letting you know that I have also encountered the issue. I have created a fix for this:

#360

Were you still facing the issue, or did you manage to find an alternative — out of curiosity?

[aleks-lynx]

Hey, as a temporary solution, I fixed that locally via actions dp_duplicate_page and dp_duplicate_post, so my code copies the taxonomies always correctly but after the plugin.