URIError: URI malformed when i run npm build in vue

[lizehua-cn]

[lizehua-cn]

what is URI malformed?
i can get the originalCss, so why does it go to the catch
and when i remove throw err, the error still exist, but npm run build can continue to run.

by the way node v8.9.4 and npm v5.6.0

[NMFR]

Can you provide some sample code so i can replicate the issue?