Hadi Rasekh

@skywickenden No, I still get the error, and I could not figure it out what's the problem

In Webpack config: ``` var ExtractTextPlugin = require('extract-text-webpack-plugin'); var WebpackIsomorphicToolsPlugin = require('webpack-isomorphic-tools/plugin'); var webpackIsomorphicToolsPlugin = new WebpackIsomorphicToolsPlugin(require('./webpack-isomorphic-tools')); { test: /\.less$/, use: ExtractTextPlugin.extract({ fallback: 'style-loader', use: 'css-loader?modules&importLoaders=2&sourceMap!autoprefixer-loader?browsers=last 2 version!less-loader?outputStyle=expanded&sourceMap=true&sourceMapContents=true' }) },...

I had the same issue and it was because I had multiple `list item` with the same `key` value, so during the update it was behaving incorrectly and throwing this...