Comment 9 for bug 1821868

I think this is a race condition in the initial setup: the race could be that on first start the Maildir resource (that backs the "Local folders") starts discovering what folders exist in ~/.local/share/mail and starts creating them in Akonadi and at the same time KMail realizes there's no Inbox, Outbox etc. in Local Folders and starts creating them.

At some point they clash as they both attempt to create the same collection - one of them wins and one of them fails with the SQL error - if KMail is the one who loses, it aborts the initial job and triggers the "fatal error" dialog.