Sketch version below 43 will cause webpack plugins undefined
https://github.com/skpm/skpm/blob/b28241db9c978e5173b80de65cf69b7ac682d312/skpm-builder/src/utils/webpackCommandPlugin/index.js#L9

Should check result here

https://github.com/skpm/skpm/blob/b28241db9c978e5173b80de65cf69b7ac682d312/skpm-builder/src/utils/webpackConfig.js#L142
