This bug happens in 1.5.x and above.
It happens when you type a character that has too much references in a cross check to the full history.
So, with that behavior, when you type a character, or, better said, an string, that matches lots of entries, there is a memory overflow and crashes.
For example, when you write www.whatever.com
. When you type www., comes the memory overflow (loads of matches for www., what is normal, by the way) and crash. No time for crashreport plugin to catch the error.