Same issue here… updated to MailPoet version 3.19.0, and all front pages went white of death, even for anonymous users. I discovered the error when Elementor failed to load. Also experienced lost connection to the database while updating MailPoet to its newest version. The problem disappears when deactivating MailPoet, and comes back again when activating it. I even tried to download new files of MailPoet, but same problem occurred. I’m using Astra Pro, Elementor Pro and JetElements and some other plugins on clean install. I deactivated all plugins and activated one by one. No doubt that MailPoet is the one to blame. I hope this get fixed asap.
