ezrecommendation:export:run throws "Call to a member function getBody() on null" exception in https://github.com/ezsystems/ezrecommendation-client/blob/d46cecd6bfebb26e3953a1723bf2b8e76965cf8a/src/lib/Service/ExportService.php#L94 when execution will reach the following branch:

https://github.com/ezsystems/ezrecommendation-client/blob/d46cecd6bfebb26e3953a1723bf2b8e76965cf8a/src/lib/Service/NotificationService.php#L57-L64

Issue could be reproduced by using invalid credentials in export.