From 1294311278ba8cb4e46913c67993707a34f5579b Mon Sep 17 00:00:00 2001
From: Dinis Lage <dinislage@senolage.com>
Date: Mon, 28 Oct 2013 13:23:01 +0000
Subject: [PATCH] Check if the country-region combination exists.

Check that a given country and region combination for an IP exists in
$crnMap.
Fix issue reported by @xifrin in
https://github.com/dlage/yii-geoip/pull/2
---
 GeoIP/CRN.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/GeoIP/CRN.php b/GeoIP/CRN.php
index d39057a..4458aaf 100644
--- a/GeoIP/CRN.php
+++ b/GeoIP/CRN.php
@@ -4513,7 +4513,7 @@ class GeoIP_CRN {
    * @return string Metro region name.
    */
   public static function getRegionName($countryCode, $regionCode) {
-    if ($countryCode === null || $regionCode === null) {
+    if ($countryCode === null || $regionCode === null || !isset(self::$crnMap[$countryCode][$regionCode])) {
       return null;
     }
     return self::$crnMap[$countryCode][$regionCode];