Printing an email

How do I print an email from within Mailspring?

To print an email conversation in Mailspring, click the small “printer” icon shown beside the subject line, or choose “Print” from the app’s menu. Mailspring prints the conversation exactly as it is displayed in the client - be sure to click to expand emails in the thread you’d like to have printed.

I follow these instructions but my emails are still not printing or an empty pdf file is created. I am on version 1.9.1-30ef802f. I understand there are major bugs with this version. Is printing one of them?