SourceTree crashes when "Open a Terminal Window" is clicked with iTerm2 set as terminal

SourceTree 2.3 crashes when the "Open Terminal..." button is clicked on the UI.

Steps to reproduce:

1. Install iTerm2 or iTerm2 version3 beta
2. In SourceTree preferences set iTerm2 in General -> Misc -> Terminal App
3. Click on "Open Terminal..."
4. Start wondering what happened! :-P

I have attached a heapdump for the same.

This affects developer workflow and ends up becoming very frustrating for those who rely on that button.