From 20d92432b2904a791cf67b308e18aa0fe5e980af Mon Sep 17 00:00:00 2001
From: Kevin Jump <kevin@thejumps.co.uk>
Date: Tue, 11 Mar 2014 06:55:59 +0000
Subject: [PATCH] Fix Null Prevalue Values on Export of DataTypes

Exporting a DataType that has a Numeric pre-value that has no value
causes an Exception - added null checking to pre value.value
---
 src/Umbraco.Core/Services/PackagingService.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Umbraco.Core/Services/PackagingService.cs b/src/Umbraco.Core/Services/PackagingService.cs
index 3a9d9dcd0f..bf6eb8e4e0 100644
--- a/src/Umbraco.Core/Services/PackagingService.cs
+++ b/src/Umbraco.Core/Services/PackagingService.cs
@@ -801,7 +801,7 @@ namespace Umbraco.Core.Services
             {
                 var prevalue = new XElement("PreValue");
                 prevalue.Add(new XAttribute("Id", pv.Value.Id));
-                prevalue.Add(new XAttribute("Value", pv.Value.Value));
+                prevalue.Add(new XAttribute("Value", pv.Value.Value == null ? "" : pv.Value.Value));
                 prevalue.Add(new XAttribute("Alias", pv.Key));
                 prevalue.Add(new XAttribute("SortOrder", sort));
                 prevalues.Add(prevalue);