• VSCode Version: 1.37.1
• OS Version: Fedora 30

I'm extracting the CSS Language Server for usage in 3rd party IDE (Eclipse IDE).
I noticed that if I start the CSS-LS without passing a dataPaths element to initialization, the LS will fail because of TypeError: Cannot read property 'map' of undefined.
One of the important lines in the stack trace is https://github.com/microsoft/vscode/blob/master/extensions/css-language-features/server/src/cssServerMain.ts#L107 .