[Resolved] CRITICAL BUG FOUND: REST API endpoints broken in translated language directories

Hi,

In addition to what I wrote above, I just noticed you also asked about The Events Calendar and MemberPress plugins.

The Events Calendar is officially compatible with WPML. However, there are a few known issues. Please check them out here: https://wpml.org/plugin/the-events-calendar/

We know MemberPress is incompatible with WPML. We mention this here: https://wpml.org/plugin/memberpress-basic/.

Regards,
Itamar.

Hi, and thanks for trying my suggestions.

Yes, I can see the 500 error persists on your site. For example, here: hidden link. Please see the attached screenshot.

I might need to esclate this issue to our second-tier supporters. Please grant me access to your staging site and, if needed, allow me to take a copy of your site. For this, I must install a plugin like Duplicator or All-in-One Migration. Please let me know if you agree. Please also share the FTP access details with me. I want to check for PHP errors, so I need to enable the WordPress debug log in the wp-config.php file. A private message is enabled for the following reply.

Regarding your questions about the MemberPress plugin. I'm sorry, but I don't have any definite answers to your questions. In the following link, we state this:

All tiers (Basic, Plus and Pro) are not fully compatible and require manual translation workflows as described in this MemberPress documentation.

https://wpml.org/plugin/memberpress-basic/
However, I can see that the link points to this MemberPress guide:
hidden link
But this guide does not explain what we mean by manual translation. To learn what we mean when saying manual translation, please check this guide:
https://wpml.org/documentation/translating-your-contents/using-different-translation-editors-for-different-pages/.

If you want to can test things with the MemberPress plugin and WPML on the following test site I've created for you:
hidden link
With this link, you will be logged in. WPML is already installed, but not configured. You are welcome to install the MemberPress plugin and test it, including how it works with restricted pages.

You can look up other similar officially compatible plugins in our plugins repository here: https://wpml.org/plugin/. Similar compatible plugins may be the following:
https://wpml.org/plugin-functionality/community/
https://wpml.org/plugin/armember/
https://wpml.org/plugin/ultimate-membership-pro/

Regards,
Itamar.

Hi, and thanks for the access details.

I've found out that the 500 error occurs only when the following plugins are active:
- WPML
- Strings Translation
- The Events Calendar
- Qode Framework
The following error shows up many times in the WordPress debug.log.

PHP Deprecated:  Creation of dynamic property Tribe__Events__Pro__Integrations__WPML__Event_Listener::$wpml is deprecated in /public_html/wp-content/plugins/events-calendar-pro/src/Tribe/Integrations/WPML/Event_Listener.php on line 52

I created a copy of your site using the Aii In One Migration plugin, then deleted the plugin. I escalated this issue to our second-tier supporters. When I have a reply from them, I'll update you here.

I appreciate your patience.
Itamar.

Hi,

I remember you saying this.
However, when I first visited your staging site, before doing anything, I found the following plugins active.
- Deston Core
- Qode Framework
- The Events Calendar
- The Events Calendar Pro
- WPML
- Strings Translation
Please see the attached screenshot. It is from the time I first logged in.
In any case, I could only trigger the 500 error when the plugins I mentioned are active.

Let's wait for our second-tier supporters' response.

Regards,
Itamar.

Hi,

Our second-tier supporter has debugged this issue and found out that it is an internal server error triggered by the fact that the .htaccess is altered and /en/ is the rewrite base:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /en/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /en/index.php [L]
</IfModule>

Our second-tier supporter added that this happens primarily on the page /en/member-home/ and basically happens on every heartbeat. This happens when third-party plugins call the flush_rewrite_rules(true) function too often. Which leads to changes in the rewrite rules in your .htaccess file, which can cause issues on your WordPress site. The full explanation can be found here:
https://wpml.org/faq/why-is-htaccess-getting-overwritten-with-the-language-folder-on-my-wpml-website/.

I've implemented the workaround on your staging site. I've added the following function to the functions.php file of the 2025 theme.

add_filter('mod_rewrite_rules', 'fix_rewritebase');
function fix_rewritebase($rules){
    $home_root = parse_url(home_url());
    if ( isset( $home_root['path'] ) ) {
        $home_root = trailingslashit($home_root['path']);
    } else {
        $home_root = '/';
    }
  
    $wpml_root = parse_url(get_option('home'));
    if ( isset( $wpml_root['path'] ) ) {
        $wpml_root = trailingslashit($wpml_root['path']);
    } else {
        $wpml_root = '/';
    }
  
    $rules = str_replace("RewriteBase $home_root", "RewriteBase $wpml_root", $rules);
    $rules = str_replace("RewriteRule . $home_root", "RewriteRule . $wpml_root", $rules);
  
    return $rules;
}

After this, I visited the English version of your site, switched between multiple pages, and the problem did not occur again. Please proceed with the same to avoid this problem on your live site.

Regards,
Itamar.