Fatal error: Uncaught Error: Call to a member function using_index_permalinks() on null in /var/www/html/wp-includes/rest-api.php:516
Stack trace:
#0 /var/www/html/wp-includes/rest-api.php(579): get_rest_url(NULL, '/', 'rest')
#1 /var/www/html/wp-content/plugins/bergsy-wp-api/bergsy-wp-api.php(33): rest_url()
#2 /var/www/html/wp-includes/class-wp-hook.php(341): bergsy_wp_api_init('')
#3 /var/www/html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array)
#4 /var/www/html/wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#5 /var/www/html/wp-settings.php(593): do_action('plugins_loaded')
#6 /var/www/html/wp-config.php(116): require_once('/var/www/html/w...')
#7 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#8 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#9 /var/www/html/index.php(17): require('/var/www/html/w...')
#10 {main}
thrown in /var/www/html/wp-includes/rest-api.php on line 516