@kriskoyk
In oc-content/plugins/backoffice_manager/email.php find line:
function email_status($item_id) {
Scroll down few lines and find this block:
$item = Item::newInstance()->findByPrimaryKey($item_id);
$item_s = ModelBO::newInstance()->getItem($item_id);
$pass = (isset($item_s['passwrd']) ? $item_s['passwrd'] : '');
Below this line, add this code:
if(@$item['fk_i_user_id'] > 0) {
return false;
}