using_index_permalinks() on null

[arena]

On a plugin, on do_action('plugins_loaded'), this function is activated

<?php
public function plugins_loaded() {
if ( ! class_exists( 'WP_Site_Health' ) ) require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
self::$_tests = WP_Site_Health::get_tests();
}

this code was working in wp 5.5.3 but fails in wp 5.6

In 5.6 returns Call to a member function using_index_permalinks() on null in wp-includes/rest-api.php:403

this code was working in wp 5.5.3 but fails in 5.6
Regards

[Clorith]

Hiya,

This appears related to the change in asynchronous tests being moved to the REST API, and the calls to rest_url in the test generator function you are calling.

The rest_url function relies on the $wp_rewrite global class when pretty permalinks are enabled, which isn't available as early as the plugins_loaded action, but should instead be used with either the init or wp hook.

[Clorith]

Since we've not head anything here in a while, I'm closing the ticket as invalid based on my previous comment about load-timing, but the ticket can still be responded to, and information still be provided if there are other scenarios that should be considered, or there is something we might have missed here.

[pfefferle]

We just recently ran into the same issue with the ActivityPub plugin: ​https://github.com/Automattic/wordpress-activitypub/issues/375

But as @Clorith said, it is a problem from the load order, changing from plugins_loaded to init solves the issue.