tl_member field blank when "'encrypt'=>true"

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Hello all,

I'm extending the tl_member (backend) and its working fine,
i added my own rgxp thats working.

Only when i add

'encrypt'=>true

in the eval it wont load the field.
It save's the field in the database but when i look at a member (backend) it wont load, its empty.

When i remove the

'encrypt'=>true

the field is loading.
Am i missing something?

Here is the code of my field.

$GLOBALS['TL_DCA']['tl_member']['fields']['bsn_nummer'] = array
(
    'label'     => &$GLOBALS['TL_LANG']['tl_member']['bsn_nummer'],
    'exclude'   => true,
    'inputType' => 'text',
    'eval'      => array('mandatory'=>true, 'encrypt'=>true, 'unique'=>true, 'rgxp'=>'bsn', 'minlength'=>9, 'maxlength'=>9, 'feViewable'=>true, 'feGroup'=>'personal', 'tl_class'=>'w50'),
    'sql'       => "varchar(9) NOT NULL default ''"
);

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Problem is solved,
it was in the sql :

'sql'       => "varchar(9) NOT NULL default ''"

changed it to :

'sql'       => "varchar(255) NOT NULL default ''"