TypeError: Cannot call method 'hasOwnProperty' of undefined

[suyuan1203]

var pinyin = require('pinyin');

console.log(pinyin('你'));

/node_modules/pinyin/src/pinyin.js:44
    if(more.hasOwnProperty(k)){
            ^
TypeError: Cannot call method 'hasOwnProperty' of undefined
    at extend xxxx/pinyintest/node_modules/pinyin/src/pinyin.js:44:13)
    at pinyin (xxxx/node_modules/pinyin/src/pinyin.js:158:13)
    at Object.<anonymous> (xxx/app.js:3:13)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:902:3