Exception: "An item with the same key has already been added" when comparing commits

I get ArgumentException when comparing two commits from https://github.com/shageman/the_next_big_thing with v.0.23.1.0

 System.ArgumentException:`  An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at LibGit2Sharp.Patch.AddFileChange(git_diff_delta* delta) in c:\Git\LibGit2Sharp-2\LibGit2Sharp\Patch.cs:line 54
   at LibGit2Sharp.Patch..ctor(DiffHandle diff) in c:\Git\LibGit2Sharp-2\LibGit2Sharp\Patch.cs:line 43
   at LibGit2Sharp.Diff.<.cctor>b__1b(DiffHandle diff) in c:\Git\LibGit2Sharp-2\LibGit2Sharp\Diff.cs:line 104
   at LibGit2Sharp.Diff.BuildDiffResult[T](DiffHandle diff) in c:\Git\LibGit2Sharp-2\LibGit2Sharp\Diff.cs:line 120
   at LibGit2Sharp.Diff.Compare[T](Tree oldTree, Tree newTree, IEnumerable`1 paths, ExplicitPathsOptions explicitPathsOptions, CompareOptions compareOptions) in c:\Git\LibGit2Sharp-2\LibGit2Sharp\Diff.cs:line 253
   at LibGit2Sharp.Diff.Compare[T](Tree oldTree, Tree newTree) in c:\Git\LibGit2Sharp-2\LibGit2Sharp\Diff.cs:line 157

The code I'am using:
this.repository.Diff.Compare<Patch>(commitB.Tree, commitA.Tree);

commitA: a9a82df96ab1f73c69b2668b91eda31e672bbf98 Move rails application back to root to make heroku deployment work again
commitB: ede0b0c359d5af516889563bebafd51b7f43115a Gemnasium doesn't recognize Gemfile when its not in the root. Let's try symlinks

Bắt đầu với LibGit2Sharp/Patch.cs tại AddFileChange và xem xét đường dẫn gọi từ Diff.cs trong quá trình Diff.Compare. Tái hiện phép so sánh bằng các commit a9a82df96ab1f73c69b2668b91eda31e672bbf98 và ede0b0c359d5af516889563bebafd51b7f43115a. Hoàn thành khi phép so sánh này không còn ném ArgumentException do khóa trùng lặp và trả về các thay đổi patch như mong đợi.