Suddenly checkout step is failing but it always worked previously

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"Could not parse object" Git Error

New to CircleCI, it’s been working great for a week or so, but today I started having issues. When I first create a new PR, it works as expected. But if I make another commit to the branch associated with the PR and push it up, CircleCI triggers the build, and then fails to find the latest commit: Cloning into '.'... Warning: Permanently added the RSA host key for IP address '192.30.253.112' to the list of known hosts. remote: Counting objects: 1965, done. remote: Compressing objects: …