Uncaught TypeError: Cannot read property 'forEach' of undefined

[zslabs]

[Enter steps to reproduce:]

1. ...
2. ...

Atom: 1.38.2 x64
Electron: 2.0.18
OS: Mac OS X 10.14.5
Thrown From: css-in-js package 1.4.0

Stack Trace

Uncaught TypeError: Cannot read property 'forEach' of undefined

At /Users/zach/.atom/packages/css-in-js/lib/convertCSS.js:45

TypeError: Cannot read property 'forEach' of undefined
    at /packages/css-in-js/lib/convertCSS.js:45:25
    at Array.forEach (<anonymous>)
    at toJS (/packages/css-in-js/lib/convertCSS.js:40:9)
    at convert (/packages/css-in-js/lib/convertCSS.js:63:12)
    at Object.convert (/packages/css-in-js/lib/css-in-js.js:38:29)
    at HTMLElement.cssInJsConvert (/packages/css-in-js/lib/css-in-js.js:19:41)
    at CommandRegistry.handleCommandEvent (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:348418)
    at Object.didConfirmSelection (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:697714)
    at SelectListView.confirmSelection (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:871573)
    at HTMLDivElement.core:confirm (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:866452)
    at CommandRegistry.handleCommandEvent (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:348418)
    at KeymapManager.t.exports.KeymapManager.dispatchCommandEvent (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:1247210)
    at KeymapManager.t.exports.KeymapManager.handleKeyboardEvent (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:1243344)
    at WindowEventHandler.handleDocumentKeyEvent (/Applications/Atom.app/Contents/Resources/app/static/<embedded>:11:283624)

Commands

     -8:40.6.0 core:paste (input.hidden-input)
     -8:39.7.0 core:save (input.hidden-input)
     -8:16.1.0 core:copy (input.hidden-input)
     -8:14.4.0 docblockr:parse-enter (input.hidden-input)
     -8:14.4.0 editor:newline (input.hidden-input)
     -8:14.2.0 docblockr:parse-enter (input.hidden-input)
     -8:14.2.0 editor:newline (input.hidden-input)
     -8:10.1.0 docblockr:parse-enter (input.hidden-input)
     -8:10.1.0 editor:newline (input.hidden-input)
     -8:07.0 core:copy (input.hidden-input)
     -8:06.5.0 core:paste (input.hidden-input)
     -8:02.2.0 core:cut (input.hidden-input)
     -7:55.7.0 core:save (input.hidden-input)
     -7:55.6.0 linter:lint (atom-text-editor.editor.is-focused)
     -7:42.8.0 core:save (input.hidden-input)
     -0:31.2.0 core:copy (input.hidden-input)

Non-Core Packages

autoclose-html 0.23.0 
autocomplete-paths 2.12.2 
block-comment-plus 0.5.1 
busy-signal 2.0.1 
carbon-now-sh 2.0.3 
css-in-js 1.4.0 
custom-app-icon 0.2.4 
docblockr 0.13.7 
double-tag 1.7.0 
emmet 2.4.3 
es6-javascript 1.0.0 
expand-region 0.5.0 
file-icons 2.1.33 
html-entities 0.4.0 
intentions 1.1.5 
language-babel 2.85.0 
language-mdx 0.1.0 
language-nunjucks 4.2.1 
linter 2.3.0 
linter-eslint 8.5.5 
linter-stylelint 4.4.9 
linter-ui-default 1.7.1 
open-this 0.5.0 
pigments 0.40.2 
platformio-ide-terminal 2.9.1 
prettier-atom 0.56.6 
sort-lines 0.19.0 
Sublime-Style-Column-Selection 1.7.5 
svg-preview 0.14.0 
sync-settings 0.8.6 
tabs-to-spaces 1.0.5