Hi there, thanks for your feedback here. As there are no known issues with MailPoet that would lead to a “white screen of death” and this issue has not been reported by other users, it is almost certainly related to a plugin or theme conflict on your site.
Please refer to the instructions here for conflict testing to try to resolve this issue on your site:
https://kb.mailpoet.com/article/204-how-to-test-for-plugins-conflict
If problems persist, please open a forum thread for further assistance.