eM Client iOS app crashing to desktop when pressing send

Using the latest eM Client iOS mobile app V10.0.1831 and iPad OS V17.4.1 and 3 differant IMAP accounts, when I compose email and press send, the app crashes instantly back to the iPad desktop with no errors.

Reopening the app, the new message is saved in drafts, but “when I press send again” after open the draft, the app crashes instantly back to the iPad desktop with no errors.

I’ve rebooted the iPad and made no difference. Only had this issue with this iOS version.