--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/ScriptObject.java	2014-12-11 19:04:59.302828084 +0100
+++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/ScriptObject.java	2014-12-11 19:04:59.214828086 +0100
@@ -3710,7 +3710,9 @@
         final ScriptObject clone = (ScriptObject) super.clone();
         if (objectSpill != null) {
             clone.objectSpill = objectSpill.clone();
-            clone.primitiveSpill = primitiveSpill.clone();
+            if (primitiveSpill != null) {
+                clone.primitiveSpill = primitiveSpill.clone();
+            }
         }
         clone.arrayData = arrayData.copy();
         return clone;