2 files changed, 40 insertions, 23 deletions

diff --git a/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs b/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
index 6a48b89..3ea7352 100644
--- a/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
+++ b/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
@@ -140,26 +140,33 @@ namespace OpenSim.Region.OptionalModules.World.NPC
 //                    acd.AgentID, i, acd.Appearance.Texture.FaceTextures[i]);
 //            }
 
-            lock (m_avatars)
-            {
-                scene.AuthenticateHandler.AddNewCircuit(npcAvatar.CircuitCode, acd);
-                scene.AddNewClient(npcAvatar, PresenceType.Npc);
+            ManualResetEvent ev = new ManualResetEvent(false);
 
-                ScenePresence sp;
-                if (scene.TryGetScenePresence(npcAvatar.AgentId, out sp))
+            Util.FireAndForget(delegate(object x) {
+                lock (m_avatars)
                 {
-                    m_log.DebugFormat(
-                        "[NPC MODULE]: Successfully retrieved scene presence for NPC {0} {1}", sp.Name, sp.UUID);
+                    scene.AuthenticateHandler.AddNewCircuit(npcAvatar.CircuitCode, acd);
+                    scene.AddNewClient(npcAvatar, PresenceType.Npc);
 
-                    sp.CompleteMovement(npcAvatar, false);
-                }
-                else
-                {
-                    m_log.WarnFormat("[NPC MODULE]: Could not find scene presence for NPC {0} {1}", sp.Name, sp.UUID);
+                    ScenePresence sp;
+                    if (scene.TryGetScenePresence(npcAvatar.AgentId, out sp))
+                    {
+                        m_log.DebugFormat(
+                            "[NPC MODULE]: Successfully retrieved scene presence for NPC {0} {1}", sp.Name, sp.UUID);
+
+                        sp.CompleteMovement(npcAvatar, false);
+                    }
+                    else
+                    {
+                        m_log.WarnFormat("[NPC MODULE]: Could not find scene presence for NPC {0} {1}", sp.Name, sp.UUID);
+                    }
+
+                    m_avatars.Add(npcAvatar.AgentId, npcAvatar);
                 }
+                ev.Set();
+            });
 
-                m_avatars.Add(npcAvatar.AgentId, npcAvatar);
-            }
+            ev.WaitOne();
 
             m_log.DebugFormat("[NPC MODULE]: Created NPC with id {0}", npcAvatar.AgentId);
 
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
index 614872e..c83df4e 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -2584,18 +2584,28 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             CheckThreatLevel(ThreatLevel.High, "osNpcRemove");
             m_host.AddScriptLPS(1);
 
+            ManualResetEvent ev = new ManualResetEvent(false);
+
             Util.FireAndForget(delegate(object x) {
-                INPCModule module = World.RequestModuleInterface<INPCModule>();
-                if (module != null)
+                try
                 {
-                    UUID npcId = new UUID(npc.m_string);
+                    INPCModule module = World.RequestModuleInterface<INPCModule>();
+                    if (module != null)
+                    {
+                        UUID npcId = new UUID(npc.m_string);
 
-                    if (!module.CheckPermissions(npcId, m_host.OwnerID))
-                        return;
+                        if (!module.CheckPermissions(npcId, m_host.OwnerID))
+                            return;
 
-                    module.DeleteNPC(npcId, World);
-                });
-            }
+                        module.DeleteNPC(npcId, World);
+                    }
+                }
+                finally
+                {
+                    ev.Set();
+                }
+            });
+            ev.WaitOne();
         }
 
         public void osNpcPlayAnimation(LSL_Key npc, string animation)