MySQL Spatial Point NULL Validation Bug?

Table with a POINT column cannot be updated.

CREATE TABLE `SomeModel` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(45) NOT NULL,
`geo` point NOT NULL,
PRIMARY KEY (`id`),
SPATIAL KEY `geo` (`geo`),
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=latin1;

$m = SomeModel::findFirst(69);
$m->name = 'New Name';
$m->save();

Results in:

[0] => Phalcon\Mvc\Model\Message Object
    (
        [_type:protected] => PresenceOf
        [_message:protected] => geo is required
        [_field:protected] => geo
        [_model:protected] => 
        [_code:protected] => 0
    )

I can't use skipAttributesOnCreate because I need to update that POINT column at other times.

Setting useDynamicUpdate(true) does nothing.

NOTE: The POINT column has a value in the database, so it's not even null.

Thanks! Adam