fixes #2507

CHANGELOG.md

@@ -9,6 +9,7 @@
 1. [](#bugfix)
     * Force question to install demo content in theme update [#2493](https://github.com/getgrav/grav/issues/2493)
     * Fixed GPM errors from blueprints not being logged [#2505](https://github.com/getgrav/grav/issues/2505)
+    * Don't error when IP is invalid [#2507](https://github.com/getgrav/grav/issues/2507)
         
 # v1.6.9
 ## 05/09/2019

system/src/Grav/Common/Utils.php

@@ -1494,12 +1494,11 @@ abstract class Utils
      * @param int $prefix
      *
      * @return string
-     * @throws \InvalidArgumentException if provided an invalid IP
      */
     public static function getSubnet($ip, $prefix = 64)
     {
         if (!filter_var($ip, FILTER_VALIDATE_IP)) {
-            throw new \InvalidArgumentException('Invalid IP: ' . $ip);
+            return $ip;
         }
 
         // Packed representation of IP