validation throws error when validatin a schema that contain multiple types

[gabrieldodan]

Hi guys,
The below code throws error when data = null. Seems there is a bug on validation algorithm. Can be fixed? Also if I remove the "required" attribute then it works proper.

Regards!

var jjv = require('jjv')();


jjv.addSchema('user', {
    type: ["object", "null"],
    properties: {
        firstname: {
            type: 'string',
            minLength: 2,
            maxLength: 15
        },
        lastname: {
            type: 'string',
            minLength: 2,
            maxLength: 25
        },
        gender: {
            type: 'string',
            enum: ['male', 'female']
        },
        email: {
            type: 'string',
            format: 'email'
        },
        password: {
            type: 'string',
            minLength: 8
        }
    },
    required: ['firstname', 'lastname']
});


var errors = jjv.validate('user', null);