Trying the option 'Create Pull Request' on a feature branch. Immediate crash.

Feature branch exists in both local and origin repos (local was cloned with tracking from origin branch). Made a single change to a string in a java file (i.e. just doing some testing).

I've tried it with a couple of things, but they all die immediately on choosing 'Create pull request...': Log looks the same on all of them.

• Uncommitted local change.
• Committed local change.
• change pushed to origin

From log, this info:

2015-08-26T09:46:15: Fatal error:
System.NullReferenceException: Object reference not set to an instance of an object.

2015-08-26T09:46:15: Stack trace:
at SourceTree.Repo.RepoHelper.CreatePullRequest(Repository repo, RepositoryRemoteProjectLink link, String remoteBranch, String commitSHA) in C:\projects\bitbucket.org\atlassian\sourcetreewin\Repo\RepoHelper.cs:line 843
at SourceTree.ViewModel.RepoTabViewModel.CreatePullRequestNoPromptIfNotAhead(String localBranch, String remote, String remoteBranch) in C:\projects\bitbucket.org\atlassian\sourcetreewin\ViewModel\RepoTabViewModel.cs:line 3341
at System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)