electron-builder: can't find module 'auto-updater'

Why would I get this error?

It happens on this line:

    if (isDevelopment || process.platform == "linux" || !electron.autoUpdater) {
      return;
    }

(and yes, it’s a signed app, via electron-builder).

ErrorCannot find module '../auto-updater'Error: Cannot find module '../auto-updater'
    at Module._resolveFilename (module.js:438:15)
    at Function.Module._resolveFilename (/Users/kunkinkan/Desktop/app/dist/osx/App.app/Contents/Resources/electron.asar/common/reset-search-paths.js:47:12)
    at Function.Module._load (module.js:386:25)
    at Module.require (module.js:466:17)
    at require (internal/module.js:20:19)
    at Object.get [as autoUpdater] (/Users/kunkinkan/Desktop/app/dist/osx/App.app/Contents/Resources/electron.asar/browser/api/exports/electron.js:17:14)
    at Object.App.autoUpdate (/Users/kunkinkan/Desktop/app/dist/osx/App.app/Contents/Resources/app.asar/main.js:108:66)
    at EventEmitter.<anonymous> (/Users/kunkinkan/Desktop/app/dist/osx/App.app/Contents/Resources/app.asar/main.js:1267:7)
    at emitOne (events.js:96:13)App.app
    at EventEmitter.emit (events.js:188:7)module.js:440
    throw err;
    ^