Failed to load the css-edit-groups package

[Enter steps to reproduce:]

1. ...
2. ...

Atom: 1.53.0 x64
Electron: 6.1.12
OS: Unknown Windows version
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>:11:583713)
    at addProperty (<embedded>:14:1423816)
    at Array.reduce (<anonymous>:null:null)
    at Obj (<embedded>:14:1423482)
    at transformNode (<embedded>:14:1424856)
    at Value (<embedded>:14:1422730)
    at transformNode (<embedded>:14:1424856)
    at addProperty (<embedded>:14:1423804)
    at Array.reduce (<anonymous>:null:null)
    at Obj (<embedded>:14:1423482)
    at transformNode (<embedded>:14:1424856)
    at Value (<embedded>:14:1422730)
    at transformNode (<embedded>:14:1424856)
    at Block (<embedded>:14:1422688)
    at transformNode (<embedded>:14:1424856)
    at Object.parse (<embedded>:14:1424877)
    at m (<embedded>:11:580956)
    at c (<embedded>:11:581162)
    at Object.readFileSync (<embedded>:11:582255)
    at <embedded>:11:3704072
    at Array.map (<anonymous>:null:null)
    at Package.loadKeymaps (<embedded>:11:3704060)
    at <embedded>:11:3697514
    at Package.measure (<embedded>:11:3696677)
    at Package.load (<embedded>:11:3697450)
    at PackageManager.loadAvailablePackage (<embedded>:11:382096)
    at <embedded>:11:380519
    at Config.transact (<embedded>:11:332489)
    at PackageManager.loadPackages (<embedded>:11:380457)
    at <embedded>:1:757118
    at Function.all (<anonymous>:null:null)
    at AtomEnvironment.startEditorWindow (<embedded>:1:759157)

Commands

Non-Core Packages

atom-beautify 0.33.4 
atom-bootstrap4 1.4.0 
atom-css-comb 3.5.1 
atom-email-snippets 0.1.0 
atom-file-icons 0.7.1 
atom-html-templates 0.1.3 
atom-html5-boilerplate 0.2.0 
atom-i18n 0.24.1 
atom-icons 0.2.2 
autoclose-html 0.23.0 
autoprefixer 4.2.0 
busy-signal 2.0.1 
color-picker 2.3.0 
css-edit-groups 0.4.2 
css-grid-snippets 1.1.1 
css-snippets 1.1.0 
css-spy 0.6.0 
double-tag 1.7.0 
editor-settings 1.1.3 
emmet 2.4.3 
flexbox-snippets 0.3.0 
goto-definition 1.3.4 
highlight-selected 0.17.0 
html-head-snippets 0.2.0 
html-to-css 0.2.2 
HTML2JS 0.2.1 
icon-fonts 3.4.0 
intentions 1.1.5 
language-html5-subtlegradient 0.1.0 
linter 3.1.1 
linter-csslint 2.0.6 
linter-ui-default 2.2.3 
minimap 4.35.7 
pigments 0.40.6 
project-manager 3.3.8 
remote-edit 1.9.0 
sync-settings 5.1.0 
todo-show 2.3.2 
vue-template 0.5.0 
w3c-validation 0.4.0 

The stack trace points to css-edit-groups loading through Atom's Package.loadKeymaps; start by inspecting the package's keymap files and searching for the duplicate cmd-l binding. Reproduce with Atom 1.53.0 and confirm the package loads without the duplicate-key error.