Mantis#2104. Thank you kindly, Godfrey for a patch that:

If the parcel pointed to by the landmark has nothing in the 
Description field (of the General tab in About Land...), a 
NullReferenceException is thrown and the client is logged out.
I added a check to the calls to Helpers.StringToField() in OpenSim.Region.ClientStack.LindenUDP.SendParcelInfo to avoid 
this issue.

1 files changed, 3 insertions, 3 deletions

diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
index 6e37e0c..2a0190b 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
@@ -6441,8 +6441,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             reply.AgentData.AgentID = m_agentId;
             reply.Data.ParcelID = parcelID;
             reply.Data.OwnerID = land.OwnerID;
-            reply.Data.Name = Helpers.StringToField(land.Name);
-            reply.Data.Desc = Helpers.StringToField(land.Description);
+            reply.Data.Name = Helpers.StringToField(land.Name != null ? land.Name : "");
+            reply.Data.Desc = Helpers.StringToField(land.Description != null ? land.Description : "");
             reply.Data.ActualArea = land.Area;
             reply.Data.BillableArea = land.Area; // TODO: what is this?
 
@@ -6459,7 +6459,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             reply.Data.GlobalX = info.RegionLocX * Constants.RegionSize + x;
             reply.Data.GlobalY = info.RegionLocY * Constants.RegionSize + y;
             reply.Data.GlobalZ = pos.Z;
-            reply.Data.SimName = Helpers.StringToField(info.RegionName);
+            reply.Data.SimName = Helpers.StringToField(info.RegionName != null ? info.RegionName : "");
             reply.Data.SnapshotID = land.SnapshotID;
             reply.Data.Dwell = 0; // TODO: not implemented yet
             reply.Data.SalePrice = land.SalePrice;