Hi,
Using version 6.6.1, I got an error when I used clearEmailAddressCriteria.
The error message: argument was assumed nonNull, but was null

The configuration I used:

MailerBuilder
                .withSMTPServer(SERVER_ADDRESS, SERVER_PORT, SERVER_USERNAME, SERVER_PASSWORD)
                .withTransportStrategy(TransportStrategy.SMTP)
                .withSessionTimeout(10 * 1000)
                .clearEmailAddressCriteria() 
                .withDebugLogging(true)
                .buildMailer();

Does anyone know how to fix it or do I have to wait for the bug fix? I investigated through the stack trace and found assumeNotNull checks for empty() of a collection too, so checking every empty collection will cause raise this error.
Thanks.