Friends,
for plugin/search/virtuemart the plugin configuration says for IDs of Custom: "Enter the IDs of the fields you want to search (comma-separated). Leave blank to search all fields."
If I leave the field empty, the plugin will NOT search custom fields.
Either the code or the field description is wrong:
if ($search_customfields) {
$value = trim($this->params->get('customfields', ""));
if (!empty($value)){
// [...]
} else {
$search_customfields = false;
}