From a2bebb6eb00fe9d2d4a98f0cdbfce6cb2b0ba6b3 Mon Sep 17 00:00:00 2001
From: Tim Young <tim.young@lightsys.org>
Date: Thu, 29 Jun 2017 09:59:01 -0500
Subject: [PATCH] Fix a crash when pinging 0.0.0.0.  Thanks Samuel for noticing
 that.

---
 EduNetworkBuilder/IPAddress.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/EduNetworkBuilder/IPAddress.cs b/EduNetworkBuilder/IPAddress.cs
index 001bf96..fb21f63 100644
--- a/EduNetworkBuilder/IPAddress.cs
+++ b/EduNetworkBuilder/IPAddress.cs
@@ -113,6 +113,7 @@ namespace EduNetworkBuilder
 
         public IPAddress(string ip)
         {
+            if (ip == null) ip = NB.ZeroIPString;
             myType = IPAddressType.ip;
             _ip = ip.ParseIp();
             var mySplitVal = ip.Split('/');