QTranslate-X redirect to Landingpage

I have a wordpress installation and a subapplication. In my subapplication i add the following lines to get access to the get_header() , get_footer() and other functions

define('WP_USE_THEMES', FALSE);
/** Loads the WordPress Environment and Template */
require(__DIR__ . '/../wordpress/wp-blog-header.php');

After the installation of the QTranslate-X Plugin I am not able to access the subapplication because it instantly redirects me to the wordpress landingpage. If i deactivate the plugin everything works fine again.

Code like echo "test"; die(); before the require will be executed so i assume it is a problem with wordpress or the plugin.

via Chebli Mohamed