Newsletter and WPML compatibility

Hi,

This is David from the WPML compatibility team.
We had a report about your plugin and WPML not working well together:
https://wpml.org/forums/topic/newsletter-plugin-2/

As you can see in our support thread, we found a way to fix this which is calling this with a plugins_loaded hook.

Change the line:
NewsletterSubscription::instance();

To the following:
add_action(‘plugins_loaded’, function() {
NewsletterSubscription::instance();
}, 99);

You probably dont want to use a closure but you get the idea.

Would like to include this change in your plugin so that your users can use WPML?