Problem deploying to production server

[buren]

Error message @ Heroku

ERROR in ./~/css-loader!./~/postcss-loader!./~/sass-loader!./src/styles.scss
Module build failed: Error: ENOENT: no such file or directory, scandir '/tmp/build_aefc76a47cbb52f8815ff47dafb3f73b/node_modules/node-sass/vendor'

# Omitted for brevity (however, for each scss file we get that ☝️ error..)

Could be an issue with yarn 😞 see yarnpkg/yarn#1832 (comment)