Uncaught TypeError: path must be a string or Buffer

[Enter steps to reproduce:]

1. ...
2. ...

Atom: 1.18.0 ia32
Electron: 1.3.15
OS: Unknown Windows version
Thrown From: autocomplete-html-entities package 0.1.0

Stack Trace

Uncaught TypeError: path must be a string or Buffer

At fs.js:631

TypeError: path must be a string or Buffer
    at TypeError (native)
    at Object.fs.open (fs.js:631:11)
    at Object.module.(anonymous function) [as open] (ELECTRON_ASAR.js:195:20)
    at Object.fs.writeFile (fs.js:1313:6)
    at /packages/autocomplete-html-entities/node_modules/fs-plus/lib/fs-plus.js:296:21
    at /packages/autocomplete-html-entities/node_modules/mkdirp/index.js:48:26
    at FSReqWrap.oncomplete (fs.js:123:15)

Commands

     -5:43.5.0 pane:close (span.name.icon.icon-file-directory)
     -5:38.2.0 tree-view:remove (div.header.list-item.project-root-header)
     -5:32.4.0 tree-view:remove-project-folder (div.header.list-item.project-root-header)
     -5:29.7.0 command-palette:toggle (atom-pane.pane.active)
     -5:06.0 core:move-down (input.hidden-input)
     -5:05.8.0 core:move-up (input.hidden-input)
     -5:04.6.0 core:confirm (input.hidden-input)
     -5:04.6.0 settings-view:install-packages-and-themes (atom-pane.pane.active)
  4x -4:35.2.0 core:confirm (input.hidden-input)
     -0:51.5.0 project-find:show (atom-pane.pane.active)
     -0:39 application:open-folder (atom-pane.pane.active)
     -0:08.9.0 remote-ftp:create-sftp-config (ul.list-inline.tab-bar.inset-panel)

Non-Core Packages

autoclose-html 0.23.0 
autocomplete-html-entities 0.1.0 
emmet 2.4.3 
node-debugger 1.10.1 
nodejs-snippets 2.0.2 
Remote-FTP 1.0.0