Wrong xwiki.authentication.createuser parameter name generation

Please see method getParam(String name, XWikiContext context) in com.xpn.xwiki.user.impl.xwiki.XWikiAuthServiceImpl

protected String getParam(String name, XWikiContext context)
{
String param = "";
try

{ param = context.getWiki().getXWikiPreference(name, context); }

catch (Exception e) {
}
if (param == null || "".equals(param)) {
try

{ param = context.getWiki().Param( "xwiki.authentication." + StringUtils.replace(name, "auth_", ".")); !!! Please see.... wrong generation parameter name. Generate "xwiki.authentication..createuser" (Two dot) }

catch (Exception e) {
}
}
if (param == null)

{ param = ""; }

return param;
}