src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/ScriptObject.java

*** 3708,3719 ****
--- 3708,3721 ----
      @Override
      protected ScriptObject clone() throws CloneNotSupportedException {
          final ScriptObject clone = (ScriptObject) super.clone();
          if (objectSpill != null) {
              clone.objectSpill = objectSpill.clone();
+             if (primitiveSpill != null) {
                  clone.primitiveSpill = primitiveSpill.clone();
              }
+         }
          clone.arrayData = arrayData.copy();
          return clone;
      }
  
      /**