Node.js Sequelize getter/setter RangeError

I'm creating a table to store user sessions in. I'm going to store the IP address as an integer, using these methods: IP-addresses stored as int results in overflow?

I would like to specify a getter and setter for the IP field so that it may automatically convert between an IP and int.

Unfortunately I get the following error and I have no idea what's happening. I've been trying to fix it for hours and Google yields me no results:

RangeError: Maximum call stack size exceeded

Model:

model = db.define(name, {
    id: {type: Sequelize.STRING, allowNull: false, primaryKey: true},
    ipAddress: {type: Sequelize.INTEGER(11).UNSIGNED, allowNull: false},
    userAgent: {type: Sequelize.STRING, allowNull: false},
    username: {type: Sequelize.STRING, allowNull: false},
    password: {type: Sequelize.STRING, allowNull: false},
    firstName: {type: Sequelize.STRING, allowNull: false},
    lastName: {type: Sequelize.STRING, allowNull: false},
    email: {type: Sequelize.STRING}
}, {
    getterMethods: {
        name: function() { return this.firstName + this.lastName },
        ipAddress: function() {
            ip = this.getDataValue("ipAddress");
            return ((ip >> 24) & 255) + "." + ((ip >> 16) & 255) + "." + ((ip >> 8) & 255) + "." + (ip & 255);
        }
    },
    setterMethods: {
        ipAddress: function(ip) {
            var parts = ip.split(".");
            var ret = 0;
            ret += parseInt(parts[0], 10) << 24;
            ret += parseInt(parts[1], 10) << 16;
            ret += parseInt(parts[2], 10) << 8;
            ret += parseInt(parts[3], 10);
            return ret;
        }
    }
});

Inserting an IP:

model.findOrCreate({id: sessionId}, {
    id: sessionId,
    ipAddress: req.ip, // === "192.168.1.79"
    userAgent: req.get("user-agent"),
    username: "test",
    password: "test",
    firstName: "first",
    lastName: "last",
    email: "email"
})

I can confirm that the getter/setter code does convert as desired, but it is not functioning in Sequelize properly.