Unable to access (Nightmare) helper from custom helper

[ThePeach]

What are you trying to achieve?

I'm trying to access Nightmare helpers from within a custom helper I've created

What do you get instead?

Provide console output if related. Use --verbose mode for more details.

Cannot read property '_locate' of undefined

Provide test source code if related

class DOMElements extends Helper {
  countElements (locator) {
    let value = this.helpers['Nightmare']._locate(locator).then(function (els) {
      return els.length
    })

    return value
  }
}

module.exports = DOMElements

Details

• CodeceptJS version: 0.5.0
• NodeJS Version: 7.4.0
• Operating System: Linux
• Nightmare version: 2.9.1
• Configuration file:

{
  "tests": "./__tests__/*_test.js",
  "timeout": 10000,
  "output": "./codecept-output",
  "helpers": {
    "Nightmare": {
      "url": "http://localhost:3001"
    },
    "DOMElements": {
      "require": "./__tests__/helpers/domelements_helper.js"
    }
  },
  "include": {
    "I": "./__tests__/steps_file.js"
  },
  "bootstrap": false,
  "mocha": {},
  "name": "flickr-test"
}

[ThePeach]

OK apparently this has been fixed on its own. Is it possible that something is being cached somewhere???
/cc @DavertMik