Conflict with any data:image in CSS

[Grawl]

If I have any url(data:image/...) in my CSS then CSSgrace fires an error:

[10:09:48] Plumber found unhandled error:
 Error in plugin 'gulp-postcss'
Message:
    ENOENT, no such file or directory 'path\to\css\data:image\svg+xml;base64,...'
Details:
    errno: -4058
    code: ENOENT
    path: path\to\css\data:image\svg+xml;base64,...
    syscall: open

I launch it in Windows and all slashes / replaced to backslashes \, even in data:image/svg.

Cannot use CSSgrace with Zurb Foundation :cry: because of this bug.

[yisibl]

Can you provide a complete test case?