In CertifyCertificateCommand::Private::createJob we have observed triggering the assert:

Q_ASSERT(key().protocol() == OpenPGP);

This was reproducible by:

• Editing a secret key with gpg --edit-key
• set trust to unkown
• certify another key in Kleopatra
• Select "yes" in the question box to mark this key as your own
• Confirm the dialog

I was able to reproduce it about 4 times but after adding some debug output I could no longer reproduce it. Now I can neiter reproduce it on Windows nor on Linux even with unchanged binaries. So it might be that this problem was there for longer but is a timing issue that we only noticed now in pre release testing.