Cake not putting quotes around field value when doing an UpdateAll

I am using UpdateAll in my Users controller as follows:

 

$this->User->MsgReceived->updateAll(
   array(
    'MsgReceived.from_user_id' => 'null',
    'MsgReceived.sender' => $username
   ),
   array('MsgReceived.from_user_id' => $user_id)
);

This causes an error because Cake is not putting quotes around the user name, even though sender is a character field:

 

Error: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'josh' in 'field list'

SQL Query: UPDATE `epd`.`inemails` AS `MsgReceived` SET `MsgReceived`.`from_user_id` = null, `MsgReceived`.`sender` = josh WHERE `MsgReceived`.`from_user_id` = 46

 

Why is this?

Thanks.

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