diff --git a/OpenSim/Framework/PrimitiveBaseShape.cs b/OpenSim/Framework/PrimitiveBaseShape.cs
index aa88717515..1f5428b382 100644
--- a/OpenSim/Framework/PrimitiveBaseShape.cs
+++ b/OpenSim/Framework/PrimitiveBaseShape.cs
@@ -450,7 +450,11 @@ namespace OpenSim.Framework
             bool lGotSculpt = false;
 
             int i = 0;
-            byte extraParamCount = data[i++];
+            byte extraParamCount = 0;
+            if (data.Length > 0)
+            {
+                extraParamCount = data[i++];
+            }
 
 
             for (int k = 0; k < extraParamCount; k++)
@@ -625,4 +629,4 @@ namespace OpenSim.Framework
             return data;
         }
     }
-}
\ No newline at end of file
+}