Failed to load the css-edit-groups package

[Enter steps to reproduce:]

1. ...
2. ...

Atom: 1.34.0 x64
Electron: 2.0.16
OS: Mac OS X 10.14.1
Thrown From: css-edit-groups package 0.4.2

Stack Trace

Failed to load the css-edit-groups package

At Duplicate key 'cmd-l'

Error: Duplicate key 'cmd-l'
    at Object.r (<embedded>:11:581990)
    at addProperty (<embedded>:14:1899484)
    at Array.reduce (<anonymous>:null:null)
    at Obj (<embedded>:14:1899150)
    at transformNode (<embedded>:14:1900524)
    at Value (<embedded>:14:1898398)
    at transformNode (<embedded>:14:1900524)
    at addProperty (<embedded>:14:1899472)
    at Array.reduce (<anonymous>:null:null)
    at Obj (<embedded>:14:1899150)
    at transformNode (<embedded>:14:1900524)
    at Value (<embedded>:14:1898398)
    at transformNode (<embedded>:14:1900524)
    at Block (<embedded>:14:1898356)
    at transformNode (<embedded>:14:1900524)
    at Object.parse (<embedded>:14:1900545)
    at m (<embedded>:11:579233)
    at c (<embedded>:11:579439)
    at Object.readFileSync (<embedded>:11:580532)
    at keymaps.getKeymapPaths.map.e (<embedded>:11:2944049)
    at Array.map (<anonymous>:null:null)
    at Package.loadKeymaps (<embedded>:11:2944037)
    at measure (<embedded>:11:2937591)
    at Package.measure (<embedded>:11:2936786)
    at Package.load (<embedded>:11:2937527)
    at PackageManager.loadAvailablePackage (<embedded>:11:381285)
    at PackageManager.loadPackage (<embedded>:11:380013)
    at PackageManager.atom.packages.loadPackage (/packages/atom-ide-ui/modules/nuclide-commons-atom/FeatureLoader.js:527:32)
    at PackageManager.activatePackage (<embedded>:11:382517)
    at <embedded>:11:899185
    at r (<embedded>:11:893791)
    at o (<embedded>:14:1032609)
    at e.bufferStream (<embedded>:14:1032697)
    at Socket.e.on (<embedded>:14:1031365)
    at emitOne (events.js:121:20)
    at Socket.emit (events.js:211:7)
    at Pipe._handle.close [as _onclose] (net.js:554:12)

Commands

     -1:36.2.0 core:copy (input.hidden-input)
     -1:30.9.0 core:paste (input.hidden-input)
     -1:27.2.0 core:save (input.hidden-input)
     -1:21.1.0 find-and-replace:show (div.tool-panel.tree-view)
  4x -1:20 core:confirm (input.hidden-input)

Non-Core Packages

atom-bracket-highlight 0.3.2 
atom-ide-ui 0.13.0 
css-edit-groups 0.4.2 
file-icons 2.1.28 
highlight-selected 0.14.0 
ide-html 0.5.0 
pigments 0.40.2 

Start by reproducing the package load failure with Atom 1.34.0 on macOS and inspect the css-edit-groups keymap loading path. Trace the reported duplicate cmd-l entry in the package's keymaps and confirm that the package loads without the duplicate-key error.