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Here's something I can't figure out. I don't need the default post_tag taxonomy, so I'm removing it with this piece of code :

function mwm_unregister_taxonomy(){

    global $wp_taxonomies;

    $taxonomy = 'post_tag';

    if ( taxonomy_exists( $taxonomy ) ) unset( $wp_taxonomies[$taxonomy] );

add_action( 'init', 'mwm_unregister_taxonomy');

But then, whenever I try to add a description to a term of any other (custom) taxonomy, via the terms edit page in WP admin, once I submit the changes it brings up the blank page with the "Cheatin, uh?" message.

Is this a bug or am I doing something wrong?

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Did small research and when you unset taxonomy $wp_taxonomies isn't object anymore, so when WordPress check capabilities while saving term description, it gets nothing and triggers wp_die – Mamaduka Sep 21 '11 at 9:24

Try using this function to avoid your problem:

function sld_unregister_taxonomy_from_object_type($taxonomy, $object_type) { 
        global $wp_taxonomies;  
        if ( !isset($wp_taxonomies[$taxonomy]) || !get_post_type_object($object_type) ) return false; 
        foreach (array_keys($wp_taxonomies[$taxonomy]->object_type) as $array_key) { 
                if ($wp_taxonomies[$taxonomy]->object_type[$array_key] == $array_key) { 
                        unset ($wp_taxonomies[$taxonomy]->object_type[$array_key]); 
                        return true; 
        return false; 


function mwm_unregister_taxonomy(){

    sld_unregister_taxonomy_from_object_type( 'post_tag', 'post' );


add_action( 'init', 'mwm_unregister_taxonomy');
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