In our site we found error “ajaxurl.indexOf is not a function”, when trying to add featured image. It prevented media library to open.
After some debugging I finally commented out /admin/class=simple-event-planner-admin.php lines 154 to 158
wp_localize_script( $this->simple_event_planner . '-admin-scripts', 'ajaxurl', array( 'url' => admin_url('admin-ajax.php'), ) );
And it fixed the error.
Maybe you can add quick check if page is using polylang in future versions?
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