Bug: Crash after blanking Unnamed Collection

After removing the name of the “Unnamed Collection” (leaving that box blank), and then closing the Collections window, Logos 4 crashes. NB. for Collections opened from the menu!

Software version: 4.2.
Reported by Dave Hooton.
Forum link: http://community.logos.com/forums/t/27923.aspx
Status: fixed in 4.2 Beta 5