Search single file history triggers error in git_commit_parent()

[soleo]

Steps to reproduce the issue

1. Clone this repo
2. Open repo with GitUp master branch
3. Type "/README.md" in top right search

It would trigger the following error

Assertion failed: (commit), function git_commit_parent, file /Users/xinjiang/projects/GitUp/GitUpKit/Third-Party/libgit2/src/commit.c, line 601.

Expected: Show file README.md's commit history

Version: GitUp master branch a510638, macOS 10.13.

[sesam]

Is this bug still occurring?