Change role's settings influence post-thumbnail

Question

In my theme functions.php i get code:

    add_action( 'admin_init', 'my_remove_menu_pages' );
function my_remove_menu_pages() {
if(!current_user_can('delete_others_posts')) {
remove_menu_page('edit.php?post_type=page');
remove_menu_page('edit-comments.php');
remove_menu_page('edit.php?post_type=slide');
}
}

but then in role Author user can't edit images for thumbnail - he gives info:

    Invalid argument supplied for foreach() in /wp-admin/includes/plugin.php on line 1286

Could anyone tell me what's wrong?

Answer 1

I'll guess that admin_init is too early for remove_menu_page, the hook should be admin_menu.