Uncaught Error: kill EPERM

[Enter steps to reproduce:]

1. ...
2. ...

**Atom**: 1.21.1 x64
**Electron**: 1.6.15
**OS**: Unknown Windows version
**Thrown From**: [pigments](https://github.com/abe33/atom-pigments) package 0.40.2

### Stack Trace

Uncaught Error: kill EPERM

```
At events.js:160

Error: kill EPERM
at exports._errnoException (util.js:1022:11)
at ChildProcess.kill (internal/child_process.js:392:26)
at Task.module.exports.Task.terminate (~/AppData/Local/atom/app-1.21.1/resources/app/src/task.js:148:31)
at ColorBuffer.module.exports.ColorBuffer.terminateRunningTask (/packages/pigments/lib/color-buffer.coffee:166:35)
at /packages/pigments/lib/color-buffer.coffee:33:8
at Function.module.exports.Emitter.simpleDispatch (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/event-kit/lib/emitter.js:25:20)
at Emitter.module.exports.Emitter.emit (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/event-kit/lib/emitter.js:141:34)
at ~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor.js:626:38
at Function.module.exports.Emitter.simpleDispatch (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/event-kit/lib/emitter.js:25:20)
at Emitter.module.exports.Emitter.emit (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/event-kit/lib/emitter.js:141:34)
at DisplayLayer.emitDidChangeSyncEvent (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/text-buffer/lib/display-layer.js:825:24)
at ~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/text-buffer/lib/text-buffer.js:780:35
at Map.forEach (native)
at TextBuffer.module.exports.TextBuffer.emitDidChangeEvent (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/text-buffer/lib/text-buffer.js:779:47)
at TextBuffer.module.exports.TextBuffer.applyChange (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/text-buffer/lib/text-buffer.js:762:18)
at TextBuffer.module.exports.TextBuffer.revertToCheckpoint (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/text-buffer/lib/text-buffer.js:1001:22)
at TextBuffer.module.exports.TextBuffer.transact (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/text-buffer/lib/text-buffer.js:955:20)
at TextEditor.module.exports.TextEditor.transact (~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor.js:1673:32)
at ~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor.js:1234:30
at TextEditor.module.exports.TextEditor.mergeSelections (~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor.js:2617:49)
at TextEditor.module.exports.TextEditor.mergeIntersectingSelections (~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor.js:2583:41)
at TextEditor.module.exports.TextEditor.mutateSelectedText (~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor.js:1232:25)
at TextEditor.module.exports.TextEditor.insertText (~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor.js:1198:25)
at TextEditor.object.(anonymous function) [as insertText] (~/AppData/Local/atom/app-1.21.1/resources/app/node_modules/underscore-plus/lib/underscore-plus.js:77:33)
at TextEditorComponent.didTextInput (~/AppData/Local/atom/app-1.21.1/resources/app/src/text-editor-component.js:1630:30)
```

### Commands

```
-2:08.6.0 snippets:expand (input.hidden-input)
-2:08.6.0 editor:indent (input.hidden-input)
8x -1:26.2.0 core:backspace (input.hidden-input)
-1:24.2.0 core:save (input.hidden-input)
-0:47 editor:newline (input.hidden-input)
3x -0:42.8.0 core:save (input.hidden-input)
-0:41.3.0 snippets:next-tab-stop (input.hidden-input)
-0:41.3.0 snippets:expand (input.hidden-input)
-0:41.3.0 editor:indent (input.hidden-input)
-0:35.5.0 core:move-left (input.hidden-input)
-0:31.4.0 autocomplete-plus:confirm (input.hidden-input)
-0:30.7.0 editor:move-to-end-of-screen-line (input.hidden-input)
2x -0:29.6.0 core:save (input.hidden-input)
-0:24.7.0 editor:consolidate-selections (input.hidden-input)
-0:24.7.0 core:cancel (input.hidden-input)
14x -0:16.6.0 core:save (input.hidden-input)
```

### Non-Core Packages

```
activate-power-mode 2.6.0
atom-beautify 0.30.5
atom-html-preview 0.2.2
atom-ternjs 0.18.3
color-picker 2.2.5
emmet 2.4.3
file-icons 2.1.13
highlight-selected 0.13.1
jquery-snippets 11.0.0
language-postcss 1.3.1
less-autocompile 1.0.0
minimap 4.29.7
pigments 0.40.2
sass-autocompile 0.13.3
simplified-chinese-menu 5.3.4
```