September 15, 2015: crash of KMail 4.14.7 at startup

The first crash of KMail was obtained while I was an e-mail. When I restarted KMail, it tried to edit the mail and crashes again. By removing the contents of the “autosave” directory, everything started up correctly:
\$ mv ~/.kde/share/apps/kmail2/autosave/* ~/tmp/

Let us note that by doing this the mail was not lost. It was in my “draft” directory as expected, and I was able to display it (but trying to edit it, it crashes: the problem is reproducible). I finally removed it to avoid such a problem to occur.