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"TypeError: Path must be a string. Received undefined" on node 6.0.0

See original GitHub issue

It seems like fromString always pass undefined as the sourcepath

TypeError: Path must be a string. Received undefined
    at assertPath (path.js:7:11)
    at Object.dirname (path.js:1324:5)
    at /home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/utils/input-source-map-tracker.js:192:56
    at Array.forEach (native)
    at trackContentSources (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/utils/input-source-map-tracker.js:189:20)
    at InputSourceMapStore.trackLoaded (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/utils/input-source-map-tracker.js:256:3)
    at fromString (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/utils/input-source-map-tracker.js:32:8)
    at InputSourceMapStore.track (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/utils/input-source-map-tracker.js:237:5)
    at Object.whenDone (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/clean.js:145:44)
    at processNext (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/imports/inliner.js:105:13)
    at importFrom (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/imports/inliner.js:79:10)
    at processNext (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/imports/inliner.js:104:16)
    at importFrom (/home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/imports/inliner.js:79:10)
    at /home/guy/WebstormProjects/selfpointrest/node_modules/clean-css/lib/imports/inliner.js:325:9
    at _combinedTickCallback (internal/process/next_tick.js:67:7)