Object.extname is deprecated.

[aledoo]

Argument to path.extname must be a string

Object.extname (/Applications/Atom.app/Contents/Resources/app.asar/src/electron-shims.js:20:10)
LessCompilerProcess.compile (/Users/alexdolara/.atom/packages/less-compiler/lib/less-compiler-process.coffee:29:24)
atom-workspace.atom.commands.add.core:save (/Users/alexdolara/.atom/packages/less-compiler/lib/less-compiler-process.coffee:13:28)
CommandRegistry.handleCommandEvent (/Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:259:29)
<unknown> (/Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:3:59)
KeymapManager.dispatchCommandEvent (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/atom-keymap/lib/keymap-manager.js:599:16)