Function.prototype.toString is not generic

[Rob Polak]

I am getting a very odd error in Mongoose, on connection to the DB I am getting a very odd toString error:

Versions:

Node v4.4.5

Mongoose 4.3.6

Error:

/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/utils.js:204

  return '[object Object]' == toString.call(arg)

                                       ^

TypeError: Function.prototype.toString is not generic

    at Object.toString (native)

    at exports.isObject (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/utils.js:204:40)

    at parseIndexOptions (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/utils.js:189:13)

    at createCreateIndexCommand (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/db.js:1620:25)

    at ensureIndex (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/db.js:1059:18)

    at Db.ensureIndex (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/db.js:1044:44)

    at wrapped [as ensureIndex] (/var/node/corp-dialer/engageDialerV2/node_modules/newrelic/lib/instrumentation/mongodb.js:240:25)

    at ensureIndex (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/collection.js:1796:13)

    at Collection.ensureIndex (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/node_modules/mongodb/lib/collection.js:1784:44)

    at wrapped [as ensureIndex] (/var/node/corp-dialer/engageDialerV2/node_modules/newrelic/lib/instrumentation/mongodb.js:240:25)

    at NativeCollection.(anonymous function) [as ensureIndex] (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:136:28)

    at create (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/lib/model.js:957:21)

    at Function.ensureIndexes (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/lib/model.js:967:3)

    at Function.init (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/lib/model.js:883:10)

    at NativeConnection.Connection.model (/var/node/corp-dialer/engageDialerV2/node_modules/mongoose/lib/connection.js:647:11)

Offending Code (utls.js):

var isObject = exports.isObject = function (arg) {
  return '[object Object]' == toString.call(arg)
}