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Error with webpack

See original GitHub issue

When I run npm run build I get the following error.

› npm run build

> react-simple-chatbot@0.1.10 build /Users/yesthis/rchat
> webpack --config webpack.config.prod.js

clean-webpack-plugin: /Users/yesthis/rchat/dist has been removed.
Hash: 6e4e3f42d328d295e90f
Version: webpack 1.15.0
Time: 4153ms
                  Asset     Size  Chunks             Chunk Names
react-simple-chatbot.js  1.09 MB       0  [emitted]  main
    + 149 hidden modules

ERROR in react-simple-chatbot.js from UglifyJs
TypeError: Cannot read property 'reset' of undefined
    at /Users/yesthis/rchat/node_modules/webpack/lib/optimize/UglifyJsPlugin.js:81:19
    at Array.forEach (native)
    at Compilation.<anonymous> (/Users/yesthis/rchat/node_modules/webpack/lib/optimize/UglifyJsPlugin.js:44:10)
    at Compilation.applyPluginsAsync (/Users/yesthis/rchat/node_modules/tapable/lib/Tapable.js:71:13)
    at Compilation.<anonymous> (/Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:567:9)
    at Compilation.applyPluginsAsync (/Users/yesthis/rchat/node_modules/tapable/lib/Tapable.js:60:69)
    at Compilation.<anonymous> (/Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:563:8)
    at Compilation.applyPluginsAsync (/Users/yesthis/rchat/node_modules/tapable/lib/Tapable.js:60:69)
    at Compilation.seal (/Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:525:7)
    at Compiler.<anonymous> (/Users/yesthis/rchat/node_modules/webpack/lib/Compiler.js:397:15)
    at /Users/yesthis/rchat/node_modules/tapable/lib/Tapable.js:103:11
    at Compilation.<anonymous> (/Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:445:10)
    at /Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:417:12
    at /Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:332:10
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:52:16
    at done (/Users/yesthis/rchat/node_modules/async/lib/async.js:246:17)
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:44:16
    at /Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:332:10
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:52:16
    at done (/Users/yesthis/rchat/node_modules/async/lib/async.js:246:17)
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:44:16
    at /Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:332:10
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:52:16
    at done (/Users/yesthis/rchat/node_modules/async/lib/async.js:246:17)
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:44:16
    at /Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:332:10
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:52:16
    at done (/Users/yesthis/rchat/node_modules/async/lib/async.js:246:17)
    at /Users/yesthis/rchat/node_modules/async/lib/async.js:44:16
    at /Users/yesthis/rchat/node_modules/webpack/lib/Compilation.js:332:10