No subject

What I was doing when the application crashed:
I wrote a message and sent it using one of my outgoing accounts (smtp server). 
I then realized it was not one I could use from my current location, and
cancelled this action through the red minus sign at the bottom right of the
KMail window.  Then I wanted to open the message in the outbox to change its
outgoing account, so I double-clicked on it.  At that time KMail crashed.

This happened in the past already; this seems to happen when message sending is
not yet fully cancelled.