Eleventastic errors on build

[djmtype]

@maxboeck I have no issues when running in dev, but on build I get the error below. Mind you, all I did was clone this repo and didn't touch any files.

I am running an M1 Mac with Node 15.x.

❯ npm run build

> [email protected] build
> run-s clean eleventy:prod --print-label

[clean        ] 
[clean        ] > [email protected] clean
[clean        ] > del-cli dist
[clean        ] 
[eleventy:prod] 
[eleventy:prod] > [email protected] eleventy:prod
[eleventy:prod] > cross-env ELEVENTY_ENV=production eleventy
[eleventy:prod] 
[eleventy:prod] Writing dist/build.txt from ./src/build.njk.
[eleventy:prod] Writing dist/feed.xml from ./src/feed.njk.
[eleventy:prod] Writing dist/robots.txt from ./src/robots.njk.
[eleventy:prod] Writing dist/serviceworker.js from ./src/serviceworker.njk.
[eleventy:prod] Writing dist/sitemap.xml from ./src/sitemap.njk.
[eleventy:prod] Writing dist/assets/scripts/main.js from ./src/assets/scripts/__scripts.11ty.js.
[eleventy:prod] Writing dist/assets/styles/main.css from ./src/assets/styles/__styles.11ty.js.
[eleventy:prod] Writing dist/404/index.html from ./src/404.njk.
[eleventy:prod] Writing dist/about/index.html from ./src/pages/about.njk.
[eleventy:prod] Writing dist/offline/index.html from ./src/pages/offline.njk.
[eleventy:prod] Writing dist/posts/2020-04-12-sample-post/index.html from ./src/posts/2020-04-12-sample-post.md.
[eleventy:prod] Writing dist/index.html from ./src/index.njk.
[eleventy:prod] Unhandled rejection in promise ([object Promise]): (more in DEBUG output)
[eleventy:prod] > The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined
[eleventy:prod] 
[eleventy:prod] `TypeError` was thrown:
[eleventy:prod]     TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined
[eleventy:prod]         at writeFile (node:fs:1499:5)
[eleventy:prod]         at go$writeFile (/Volumes/Evo/Sites/eleventastic/node_modules/graceful-fs/graceful-fs.js:138:14)
[eleventy:prod]         at Object.writeFile (/Volumes/Evo/Sites/eleventastic/node_modules/graceful-fs/graceful-fs.js:135:12)
[eleventy:prod]         at /Volumes/Evo/Sites/eleventastic/node_modules/fs-extra/lib/output/index.js:18:27
[eleventy:prod]         at /Volumes/Evo/Sites/eleventastic/node_modules/universalify/index.js:23:46