diff --git a/XenModel/Utils/Helpers.cs b/XenModel/Utils/Helpers.cs
index 987a905be..ce24b9860 100755
--- a/XenModel/Utils/Helpers.cs
+++ b/XenModel/Utils/Helpers.cs
@@ -1410,6 +1410,9 @@ namespace XenAdmin.Core
         /// </summary>
         public static string OEMName(Host host)
         {
+            if (host.software_version == null)
+                return string.Empty;
+
             if (!host.software_version.ContainsKey("oem_manufacturer"))
                 return "";