TypeError: expecting an array or an iterable object but got [object Null]

[hfreire]

View details in Rollbar: https://rollbar.com/hfreire/get-me-a-date/items/34/

TypeError: expecting an array or an iterable object but got [object Null]
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/promise.js", line 10, in apiRejection
        return Promise.reject(new TypeError(msg));
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/promise_array.js", line 63, in ReductionPromiseArray.init
            var err = apiRejection(
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/promise.js", line 566, in Promise._settlePromise
                handler.call(receiver, value, promise);
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/promise.js", line 614, in Promise._settlePromise0
        this._settlePromise(promise, handler, receiver, value);
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/promise.js", line 693, in Promise._settlePromises
                this._settlePromise0(this._fulfillmentHandler0, value, bitField);
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/async.js", line 133, in Async._drainQueue
                fn._settlePromises();
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/async.js", line 143, in Async._drainQueues
        this._drainQueue(this._normalQueue);
  File "/opt/get-me-a-date/node_modules/bluebird/js/release/async.js", line 17, in Immediate.Async.drainQueues
            self._drainQueues();
  File "timers.js", line 789, in runCallback
  File "timers.js", line 751, in tryOnImmediate
  File "timers.js", line 722, in processImmediate [as _immediateCallback]