docsify: docsify-server-renderer error

My code here:

// docs-renderer.js
const fs = require('fs')
const path = require('path')
const docsifyRenderer = require('docsify-server-renderer')
const templatePath = path.resolve(__dirname, '../../docs/index.template.html')

const docsifyConfig = {
  basePath: '/src',
  // ...
}

const renderer = new docsifyRenderer({
  template: fs.readFileSync(templatePath, 'utf-8'),
  config: docsifyConfig
})

async function test () {
  renderer.renderToString('docs/')
    .then(console.log)
    .catch(console.log)
}

test()

module.exports = renderer

Then:

TypeError: Cannot read property 'indexOf' of undefined
    at AbstractHistory.parse (/Users/zhangshuyao/Sites/git/docs/node_modules/docsify-server-renderer/build.js:349:30)
    at Compiler.compile (/Users/zhangshuyao/Sites/git/docs/node_modules/docsify-server-renderer/build.js:553:37)
    at Renderer.<anonymous> (/Users/zhangshuyao/Sites/git/docs/node_modules/docsify-server-renderer/build.js:1126:28)
    at Generator.next (<anonymous>)
    at c (/Users/zhangshuyao/Sites/git/docs/node_modules/docsify-server-renderer/build.js:14:99)
    at process._tickCallback (internal/process/next_tick.js:68:7)
    at Function.Module.runMain (internal/modules/cjs/loader.js:744:11)
    at startup (internal/bootstrap/node.js:285:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:739:3)

There is shotcut of docsify-server-renderer/build.js

// line 553
  var curFileName = this$1.router.parse().file;
// line 346-360
  AbstractHistory.prototype.parse = function parse (path$$1) {
    var query = '';

    var queryIndex = path$$1.indexOf('?');
    if (queryIndex >= 0) {
      query = path$$1.slice(queryIndex + 1);
      path$$1 = path$$1.slice(0, queryIndex);
    }

    return {
      path: path$$1,
      file: this.getFile(path$$1),
      query: parseQuery(query)
    }
  };

I think maybe there is something wrong with my code or build.js after rollup-build, pls help me to check it.

Best