git error when running yarnhook

I cloned a project that uses yarnhook, changed a file, and then ran `git checkout` on that file. `yarnhook` got triggered, but it failed with this output:

```
/node_modules/.bin/yarnhook
/node_modules/yarnhook/node_modules/execa/index.js:303

throw (result.error || new Error(result.stderr === '' ? result.stdout : result.stderr));
^
Error: fatal: Log for 'HEAD' only has 1 entries.
at Function.module.exports.sync (/node_modules/yarnhook/node_modules/execa/index.js:303:26)
at Object. (/node_modules/yarnhook/index.js:58:38)
at Module._compile (internal/modules/cjs/loader.js:1147:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1167:10)
at Module.load (internal/modules/cjs/loader.js:996:32)
at Function.Module._load (internal/modules/cjs/loader.js:896:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
at internal/main/run_main_module.js:17:47
error Command failed with exit code 1.
```

Tried googling but found nothing. Any advice?

Reproduce the failure by editing a file and running git checkout in a project using yarnhook. Start at node_modules/yarnhook/index.js:58 and the reported execa error at index.js:303; determine why this Git operation produces the error and verify that the hook completes successfully afterward.

Written by the indexing model from the issue text.