Laravel error model using function attributesToArray with created_at

I'm trying to clone a model using the function attributesToArray; but, I've got a problem with dates created_at = '0000-00-00 00:00:00.000000'.

This is my code:

$user2 = new User2(); 
$user2->fill($user->attributesToArray());

Exception returns me the message:

InvalidArgumentException Unexpected data found. Trailing data

Solution

The answer is change the model:

public function getDates()
{
    return array();
}