{"action":"opened","issue":{"url":"https://api.github.com/repos/skyrpex/gulp-extract-css-urls/issues/1","repository_url":"https://api.github.com/repos/skyrpex/gulp-extract-css-urls","labels_url":"https://api.github.com/repos/skyrpex/gulp-extract-css-urls/issues/1/labels{/name}","comments_url":"https://api.github.com/repos/skyrpex/gulp-extract-css-urls/issues/1/comments","events_url":"https://api.github.com/repos/skyrpex/gulp-extract-css-urls/issues/1/events","html_url":"https://github.com/skyrpex/gulp-extract-css-urls/issues/1","id":136635658,"number":1,"title":"TypeError: must start with number, buffer, array or string","user":{"login":"Dinistro","id":15726717,"avatar_url":"https://avatars.githubusercontent.com/u/15726717?v=3","gravatar_id":"","url":"https://api.github.com/users/Dinistro","html_url":"https://github.com/Dinistro","followers_url":"https://api.github.com/users/Dinistro/followers","following_url":"https://api.github.com/users/Dinistro/following{/other_user}","gists_url":"https://api.github.com/users/Dinistro/gists{/gist_id}","starred_url":"https://api.github.com/users/Dinistro/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Dinistro/subscriptions","organizations_url":"https://api.github.com/users/Dinistro/orgs","repos_url":"https://api.github.com/users/Dinistro/repos","events_url":"https://api.github.com/users/Dinistro/events{/privacy}","received_events_url":"https://api.github.com/users/Dinistro/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-02-26T09:04:15Z","updated_at":"2016-02-26T09:04:15Z","closed_at":null,"body":"When I try to run this code: \r\n\r\n```\r\nreturn gulp.src('oblique-ui.css', {cwd : 'node_modules/oblique-ui/dist/css'})\r\n      .pipe(extractCssUrls())\r\n      .pipe(debug());\r\n```\r\nI get this error message:\r\n\r\n```\r\nTypeError: must start with number, buffer, array or string\r\n    at fromObject (buffer.js:140:11)\r\n    at new Buffer (buffer.js:62:10)\r\n    at Converter.toBase64 (/home/dev/development/git-projects/oblique-reactive2/node_modules/convert-source-map/index.js:63:10)\r\n    at Converter.toComment (/home/dev/development/git-projects/oblique-reactive2/node_modules/convert-source-map/index.js:67:21)\r\n    at DestroyableTransform._transform (/home/dev/development/git-projects/oblique-reactive2/node_modules/gulp-extract-css-urls/lib/index.js:95:87)\r\n    at DestroyableTransform.Transform._read (/home/dev/development/git-projects/oblique-reactive2/node_modules/readable-stream/lib/_stream_transform.js:172:10)\r\n    at DestroyableTransform.Transform._write (/home/dev/development/git-projects/oblique-reactive2/node_modules/readable-stream/lib/_stream_transform.js:160:12)\r\n    at doWrite (/home/dev/development/git-projects/oblique-reactive2/node_modules/readable-stream/lib/_stream_writable.js:335:12)\r\n    at writeOrBuffer (/home/dev/development/git-projects/oblique-reactive2/node_modules/readable-stream/lib/_stream_writable.js:321:5)\r\n    at DestroyableTransform.Writable.write (/home/dev/development/git-projects/oblique-reactive2/node_modules/readable-stream/lib/_stream_writable.js:248:11)\r\n\r\n```\r\nAs far as I know, the `file.sourceMap` in the `index.js` is `undefinied` and causes this error.\r\n\r\n"}}