ReferenceError: names is not defined

[nemo]

< ReferenceError: names is not defined
<     at args.forEach.arg (/...../node_modules/lib/lib/parse.js:24:34)
<     at Array.forEach (native)
<     at module.exports (/...../node_modules/lib/lib/parse.js:17:8)
<     at Proxy.__call__ (/...../node_modules/lib/lib.js:21:19)
<     at Promise (/...../lib/emails.js:39:29)
<     at Promise._execute (/...../node_modules/bluebird/js/release/debuggability.js:300:9)
<     at Promise._resolveFromExecutor (/...../node_modules/bluebird/js/release/promise.js:483:18)
<     at new Promise (/...../node_modules/bluebird/js/release/promise.js:79:10)
<     at Promise.map (/...../lib/emails.js:17:60)
<     at tryCatcher (/...../node_modules/bluebird/js/release/util.js:16:23)
<     at MappingPromiseArray._promiseFulfilled (/...../node_modules/bluebird/js/release/map.js:61:38)
<     at MappingPromiseArray.PromiseArray._iterate (/...../node_modules/bluebird/js/release/promise_array.js:114:31)
<     at MappingPromiseArray.init (/...../node_modules/bluebird/js/release/promise_array.js:78:10)
<     at MappingPromiseArray._asyncInit (/...../node_modules/bluebird/js/release/map.js:30:10)
<     at Async._drainQueue (/...../node_modules/bluebird/js/release/async.js:138:12)
<     at Async._drainQueues (/...../node_modules/bluebird/js/release/async.js:143:10)

Here's the error in parse.js:

args.forEach(arg => {
    if (
      arg !== null &&
      typeof arg !== 'boolean' &&
      typeof arg !== 'string' &&
      typeof arg !== 'number'
    ) {
      let err = new TypeError(`${names.join('.')}: All arguments must be Boolean, Number, String or null`);
      let stack = err.stack.split('\n');
      stack = stack.slice(0, 1).concat(stack.slice(5));
      stack[1] = stack[1].replace('Object.<anonymous>', names.join('.'));
      err.stack = stack.join('\n');
      throw err;
    }
  });