diff --git a/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs b/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs
index dbb61fddc6..6623165897 100644
--- a/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs
+++ b/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs
@@ -2318,6 +2318,8 @@ namespace OpenSim.Region.ScriptEngine.Common
         public void llRezAtRoot(string inventory, LSL_Types.Vector3 pos, LSL_Types.Vector3 vel, LSL_Types.Quaternion rot, int param)
         {
             m_host.AddScriptLPS(1);
+            if (Double.IsNaN(rot.x) || Double.IsNaN(rot.y) || Double.IsNaN(rot.z) || Double.IsNaN(rot.s))
+                return;
             bool found = false;
 
             float dist = (float)llVecDist(llGetPos(), pos);
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index bff63f1006..0cfa06f2d0 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -2200,13 +2200,15 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
         public void llRezAtRoot(string inventory, LSL_Types.Vector3 pos, LSL_Types.Vector3 vel, LSL_Types.Quaternion rot, int param)
         {
+            m_host.AddScriptLPS(1);
+
+            if (Double.IsNaN(rot.x) || Double.IsNaN(rot.y) || Double.IsNaN(rot.z) || Double.IsNaN(rot.s))
+                return;
             float dist = (float)llVecMag(llGetPos() - pos);
 
             if (dist > m_ScriptDistanceFactor * 10.0f)
                 return;
 
-            m_host.AddScriptLPS(1);
-
             foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
             {
                 if (inv.Value.Name == inventory)