The library has a bug where it tries to get the message from the response like it was an instance of WP_Error, and that is not always the case when the response returned a response code different than 200.
The error log sent by the user:
Ein Fehler vom Typ E_ERROR wurde in der Zeile 119 der Datei /home/user/wordpress/wp-content/plugins/publishpress-pro/vendor/alledia/wordpress-edd-license-integration/src/core/License.php verursacht. Fehlermeldung: Uncaught Error: Call to a member function get_error_message() on array in /home/user/wordpress/wp-content/plugins/publishpress-pro/vendor/alledia/wordpress-edd-license-integration/src/core/License.php:119
Stack trace:
The library has a bug where it tries to get the message from the response like it was an instance of WP_Error, and that is not always the case when the response returned a response code different than 200.
The error log sent by the user: