Max query returning null object with sequelise.js

I am having an issue with sequelise.js's max query functionality where the "success" object being returned is null despite the logged query being as expected (and working against the database being targeted).

Without further ado here is the codez;

LunaEventDomain
        .max("date", {where : { "luna_event_location_id": lunaLocationId }})
        .success(function(max) {
            console.log("Max object, %s", max);
            console.log("Max object is date? [%s]", typeof max == Date);
            var result;
            if (max == null) {
                result = false;
            } else {
                result = checkHasRecordsAfter(daysInAdvance, max);
            }
            return result;
        })
        .error(function(error) {
            console.log("Encountered an error from max query, [%s]", error);
        });

Snippet 1: The max query code.

The log notes;

Executing (default): SELECT max(`date`) as `max` FROM `luna_event` WHERE `luna_event`.`luna_event_location_id`='1';
Max object, null
Max object is date? [false]

Snippet 2: The resulting log.

The LunaEventDomain table has (MySQL) schema;

id                      int(11)
event_type              enum('LOW_WATER', 'HIGH_WATER', 'MOONRISE', 'MOONSET')
date                    datetime
height                  decimal(10,3)
luna_event_location_id  int(11)

When I execute the logged query against the target database I retrieve an appropriate response. What am I doing wrong? I would like the max result to be delivered as part of the success(function(max) { ... }) callback.