remove customfield delete function

zimbraSingle.php

@@ -97,9 +97,6 @@ function zimbraSingleCreateCustomFields($packageconfigoption)
 {
     $whmcs = App::self();
     $productID = $whmcs->get_req_var('id');
-    Capsule::table('tblcustomfields')
-        ->where('relid', '=', $productID)
-        ->delete();
     try {
         Capsule::table('tblcustomfields')
         ->insert(