Version: 1.30.0-insider (user setup)
Commit: 85f805acf9436381b878cab5ab6c5146beec7893
Date: 2018-12-05T06:19:36.555Z
Electron: 2.0.12
Chrome: 61.0.3163.100
Node.js: 8.9.3
V8: 6.1.534.41
OS: Windows_NT x64 10.0.17134

Steps to Reproduce:

1. Fork and clone
2. Make change
3. Add/commit/push
4. Click Create PR + icon
5. Select remote and branch
6. Get error

Output:

[Info] GitHubRepository> Creating pull requests failed: {"message":"Validation Failed","errors":[{"resource":"PullRequest","field":"head","code":"invalid"}],"documentation_url":"https://developer.github.com/v3/pulls/#create-a-pull-request"}