Codeowner crash

[orta]

This is before we even do any work

(node:3743) UnhandledPromiseRejectionWarning: TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type object
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    at validateString (internal/validators.js:112:11)
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    at Object.normalize (path.js:1006:5)
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    at trueCasePathSync (/home/runner/work/_actions/orta/code-owner-self-merge/master/node_modules/true-case-path/index.js:12:31)
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    at new Codeowners (/home/runner/work/_actions/orta/code-owner-self-merge/master/node_modules/codeowners/codeowners.js:21:29)
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    at commentOnMergablePRs (/home/runner/work/_actions/orta/code-owner-self-merge/master/index.js:36:14)
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    at run (/home/runner/work/_actions/orta/code-owner-self-merge/master/index.js:14:5)
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    at Object.<anonymous> (/home/runner/work/_actions/orta/code-owner-self-merge/master/index.js:222:5)
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    at Module._compile (internal/modules/cjs/loader.js:959:30)
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    at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)
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    at Module.load (internal/modules/cjs/loader.js:815

[orta]

https://github.com/microsoft/TypeScript-Website/runs/1052007433?check_suite_focus=true