Exception During Rebase: No error message has been provided by the native library

I've seen this happen a couple times out of a hundred, so it is difficult to reproduce. When it has happened, I've rebased successfully from the command-line without any conflicts; then when I re-run this it still fails.

Stack Trace

LibGit2Sharp.LibGit2SharpException: No error message has been provided by the native library
at LibGit2Sharp.Core.Ensure.HandleError(Int32 result)
at LibGit2Sharp.Core.Proxy.git_rebase_init(RepositoryHandle repo, AnnotatedCommitHandle branch, AnnotatedCommitHandle upstream, AnnotatedCommitHandle onto, GitRebaseOptions options)
at LibGit2Sharp.Rebase.Start(Branch branch, Branch upstream, Branch onto, Identity committer, RebaseOptions options)

Reproduction steps

var rebaseResult = repository.Rebase.Start(featureBranch, masterBranch, null, _getIdentity(repository), new RebaseOptions());

Expected behavior

A rebaseResult.Status

Actual behavior

An exception

Version of LibGit2Sharp (release number or SHA1)

0.26.0

Operating system(s) tested; .NET runtime tested

Windows 10

Start with the Rebase.Start call in the reproduction and trace it through LibGit2Sharp.Rebase.Start, Core.Proxy.git_rebase_init, and Core.Ensure.HandleError. Reproduce on Windows 10 with LibGit2Sharp 0.26.0 and the supplied branch arguments, then compare the native failure with the expected rebaseResult.Status. Done means the intermittent case is explained and handled without the empty-error exception.