-// Query for referal levels and percents
-$result_depths = SQL_QUERY("SELECT `level`, `percents` FROM `{?_MYSQL_PREFIX?}_refdepths` ORDER BY `level` ASC", __FILE__, __LINE__);
+// Extension ext-user is highly required
+if ((!isExtensionActive('user')) && (!isAdmin())) {
+ displayMessage('{%pipe,generateExtensionInactiveNotInstalledMessage=user%}');
+ return;
+} // END - if
+
+// Query for referral levels and percents
+$result_depths = SQL_QUERY('SELECT `level`, `percents` FROM `{?_MYSQL_PREFIX?}_refdepths` ORDER BY `level` ASC', __FILE__, __LINE__);