npm update 失败，求解决方法

Question

执行命令

npm -g update

提示

npm ERR! Object.keys called on non-object
npm ERR! 
npm ERR! If you need help, you may report this error at:
npm ERR!     <http://github.com/npm/npm/issues>
npm ERR! Darwin 14.0.0
npm ERR! argv "node" "/usr/local/bin/npm" "-g" "update"
npm ERR! node v0.10.34
npm ERR! npm  v2.1.14

npm ERR! Object.keys called on non-object
npm ERR! 
npm ERR! If you need help, you may report this error at:
npm ERR!     <http://github.com/npm/npm/issues>
npm ERR! Darwin 14.0.0
npm ERR! argv "node" "/usr/local/bin/npm" "-g" "update"
npm ERR! node v0.10.34
npm ERR! npm  v2.1.14

npm ERR! Object.keys called on non-object
npm ERR! 
npm ERR! If you need help, you may report this error at:
npm ERR!     <http://github.com/npm/npm/issues>

npm ERR! Please include the following file with any support request:
npm ERR!     /Library/WebServer/Documents/wordpress/npm-debug.log

好像不是网络问题，VPN也不好使，请问怎么解决？

Answer 1

npm i -g npm@next 先用预览版本，v2.1.14 有 bug。

Answer 2

我刚开始使用 npm i -g npm 更新时，出错了，后来发现在 mac 上，必须要用 sudo npm i -g npm 才可以

Answer 3

会不会已经是最新的了。
我这边npm -g update第一遍OK，第二遍出现跟你一样的错误。

Answer 4

npm install -g npm

Answer 5

执行npm i -g npm@4.5.0 -g

报错：
/usr/lib
└── (empty)

npm ERR! Linux 3.10.0-514.16.1.el7.x86_64
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "install" "npm@4.5.0" "-g"
npm ERR! node v6.10.2
npm ERR! npm v3.10.10
npm ERR! path /usr/lib/node_modules/npm/node_modules/node-gyp
npm ERR! code EEXIST
npm ERR! errno -17
npm ERR! syscall mkdir

npm ERR! EEXIST: file already exists, mkdir '/usr/lib/node_modules/npm/node_modules/node-gyp'
npm ERR! File exists: /usr/lib/node_modules/npm/node_modules/node-gyp
npm ERR! Move it away, and try again.

npm ERR! Please include the following file with any support request:
npm ERR! /root/npm-debug.log
npm ERR! code 1