Cannot set property initialConfig of #<LessPlugin> which has only a getter

[balupton]

Less plugin has an issue with DocPad v6.80.0

warning: Failed to load the plugin: docpad-plugin-less at /Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad-plugin-less
The error follows:

TypeError: Cannot set property initialConfig of #<LessPlugin> which has only a getter
    at new BasePlugin (/Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/plugin.js:56:26)
    at new LessPlugin (/Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad-plugin-less/source/less.plugin.js:7:9)
    at PluginLoader.create (/Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/plugin-loader.js:260:26)
    at /Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/docpad.js:3595:29
    at PluginLoader.load (/Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/plugin-loader.js:240:7)
    at /Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/docpad.js:3590:27
    at PluginLoader.unsupported (/Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/plugin-loader.js:146:7)
    at /Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/docpad.js:3568:25
    at success (/Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/plugin-loader.js:71:16)
    at safefs.readFile (/Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/docpad/esnext/lib/plugin-loader.js:110:18)
    at /Users/balupton/Projects/docpad/extras/skeletons/docpad-bootstrap/node_modules/graceful-fs/graceful-fs.js:78:16
    at FSReqWrap.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:53:3)