Win SourceTree crashes at Edit commit message in rebase interactively

I am using Source Tree for Windows 1.6.11 and 1.6.10

My Source Tree crashes when i make these steps:
1- at any branch i rebase interactively from any commit
2 - At the rebase window, i pick a commit and press the Edit Message Button.
3 - I write the new message or even press cancel button
4 - SourceTree crashes and Windows 7 launch the message that SourceTree stopped working.

Uninstalled source tree and deleted project and made all over again.
The problem remained.

The problem doenst happen in version 1.6.8