Uncaught TypeError: Cannot read property 'editor' of undefined

[xialei2200]

[Enter steps to reproduce:]

1. ...
2. ...

Atom: 1.35.1 x64
Electron: 2.0.18
OS: Unknown Windows version
Thrown From: language-markdown package 0.29.0

Stack Trace

Uncaught TypeError: Cannot read property 'editor' of undefined

At C:\Users\xialei\.atom\packages\language-markdown\lib\main.js:205

TypeError: Cannot read property 'editor' of undefined
    at Object.indentListItem (/packages/language-markdown/lib/main.js:205:13)
    at /packages/language-markdown/lib/main.js:190:111)
    at CommandRegistry.handleCommandEvent (~/AppData/Local/atom/app-1.35.1/resources/app/static/<embedded>:11:350017)
    at KeymapManager.t.exports.KeymapManager.dispatchCommandEvent (~/AppData/Local/atom/app-1.35.1/resources/app/static/<embedded>:11:1212981)
    at KeymapManager.t.exports.KeymapManager.handleKeyboardEvent (~/AppData/Local/atom/app-1.35.1/resources/app/static/<embedded>:11:1209115)
    at WindowEventHandler.handleDocumentKeyEvent (~/AppData/Local/atom/app-1.35.1/resources/app/static/<embedded>:11:285196)

Commands

     -0:08.2.0 markdown:indent-list-item (input.hidden-input)
     -0:08.2.0 snippets:next-tab-stop (input.hidden-input)
     -0:08.2.0 snippets:expand (input.hidden-input)
     -0:08.2.0 editor:indent (input.hidden-input)

Non-Core Packages

language-markdown 0.29.0 
markdown-image-paste 2.5.2 
markdown-preview-plus 3.8.1 
markdown-scroll-sync 2.1.2 
markdown-table-editor 1.1.1 
pdf-view 0.71.0 

[burodepeper]

Thanks for the report.
What steps do I need to take to reproduce the issue?