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SyntaxError: Unexpected token \ in compiler.js

See original GitHub issue

I got an error while running webpack. The cause of error seems to be JSON.parse(childCompilation.assets[outputName].source()) in the compiler.js.

webpack.config.js:

    var FaviconsWebpackPlugin = require('favicons-webpack-plugin');
    ...
    plugins: [
      ...
      new FaviconsWebpackPlugin('./client/assets/favicon.png')
    ]

Log:

/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack-core/lib/NormalModuleMixin.js:151
                                throw e;
                                ^

SyntaxError: Unexpected token \
    at Object.parse (native)
    at /Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/favicons-webpack-plugin/lib/compiler.js:83:23
    at Compiler.<anonymous> (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack/lib/Compiler.js:214:10)
    at /Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack/lib/Compiler.js:403:12
    at Compiler.next (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/tapable/lib/Tapable.js:67:11)
    at Compiler.<anonymous> (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack/lib/CachePlugin.js:40:4)
    at Compiler.applyPluginsAsync (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/tapable/lib/Tapable.js:71:13)
    at Compiler.<anonymous> (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack/lib/Compiler.js:400:9)
    at Compilation.<anonymous> (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack/lib/Compilation.js:577:13)
    at Compilation.applyPluginsAsync (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/tapable/lib/Tapable.js:60:69)
    at Compilation.<anonymous> (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack/lib/Compilation.js:572:10)
    at Compilation.next (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/tapable/lib/Tapable.js:67:11)
    at Compilation.<anonymous> (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/favicons-webpack-plugin/lib/compiler.js:57:7)
    at Compilation.applyPluginsAsync (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/tapable/lib/Tapable.js:71:13)
    at Compilation.<anonymous> (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/webpack/lib/Compilation.js:567:9)
    at Compilation.applyPluginsAsync (/Users/lvarayut/Documents/Web development/Projects/relay-fullstack/node_modules/tapable/lib/Tapable.js:60:69)