unidentified index

In migrating from 1.2.5 to 2.5.3 I am getting undefined index for input of name, business name, phone and email.  I updated form as much as possible - but if I use DataHelper - I can no longer use array - is there a quick way to fix this using isset() or do i need to rewrite - here is the code: - Thank you

echo '<div class="highlight-box">';

    echo $this->Form->create(null, array('url' => $loc)); 

    echo $this->Form->hidden('adv_form', array('value' => 'adv_form'));

    echo $this->Form->input('name', array('type'=>'text', 'value'=>$this->data['name'], 'label'=>'', 'after'=>'Contact Name'));

    if(array_key_exists('name', $this->Errors)){echo $this->Errors['name'];}

    echo $this->Form->input('business_name', array('type'=>'text', 'value'=>$this->data['business_name'], 'label'=>'', 'after'=>'Business Name'));

    echo $this->Form->input('phone', array('type'=>'text', 'value'=>$this->data['phone'], 'label'=>'', 'after'=>'Phone Number'));

    if(array_key_exists('phone', $this->Errors)){echo $this->Errors['phone'];}

    echo $this->Form->input('email', array('type'=>'text', 'value'=>$this->data['email'], 'label'=>'', 'after'=>'e-mail'));

    if(array_key_exists('email', $this->Errors)){echo $this->Errors['email'];}

    echo $this->Form->submit('add.gif');

    echo $this->Form->end();

    

    if($msg != '')

    {

        echo '<br />';

        echo $msg;

        echo '<br />';

    }

echo '</div>';

?>

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