We have checked your app logs and found out the polylang plugin in your application is causing a fatal error to display the http 500. We are sharing the complete error for your reference here:
Got error ‘PHP message: PHP Fatal error: Uncaught Error: Cannot use object of type WP_Error as array in /home/152166.cloudwaysapps.com/bdhyhkkfrm/public_html/wp-includes/class-wp-list-util.php:152\nStack trace:\n#0 /home/152166.cloudwaysapps.com/bdhyhkkfrm/public_html/wp-includes/functions.php(3648): WP_List_Util->pluck(‘term_id’, NULL)\n#1 /home/152166.cloudwaysapps.com/bdhyhkkfrm/public_html/wp-content/plugins/polylang/modules/sync/sync-tax.php(173): wp_list_pluck(Object(WP_Error), ‘term_id’)\n#2 /home/152166.cloudwaysapps.com/bdhyhkkfrm/public_html/wp-content/plugins/polylang/modules/sync/admin-sync.php(76): PLL_Sync_Tax->copy(1606, 1632, ‘nl’)\n#3 /home/152166.cloudwaysapps.com/bdhyhkkfrm/public_html/wp-includes/class-wp-hook.php(286): PLL_Admin_Sync->add_meta_boxes(‘post’, Object(WP_Post))\n#4 /home/152166.cloudwaysapps.com/bdhyhkkfrm/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array)\n#5 /home/152166.cloudwaysapps.com/bdhyhkkfrm/public_html/wp-includes/plugin.php(453): WP_Hook->do_acti…\n’, referer: https://wilmawestenberg.nl/wp-admin/edit.php
please advice!