From: Christopher Yeoh <cyeoh@au1.ibm.com>

The attached patch fixes the bug where llCreateLink will cause a null dereference
if the avatar who gave link permission for the object is no longer logged in.

1 files changed, 4 insertions, 1 deletions

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index f748522..52e7288 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -3028,7 +3028,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
               ShoutError("Script trying to link but PERMISSION_CHANGE_LINKS permission not set!");
               return;
             }
-            IClientAPI client = World.GetScenePresence(m_host.TaskInventory[invItemID].PermsGranter).ControllingClient;
+            IClientAPI client = null;
+            ScenePresence sp = World.GetScenePresence(m_host.TaskInventory[invItemID].PermsGranter);
+            if (sp!=null) 
+                client = sp.ControllingClient;
             SceneObjectPart targetPart = World.GetSceneObjectPart((UUID)target);
             if (targetPart.ParentGroup.RootPart.AttachmentPoint != 0)
                 return; // Fail silently if attached