src/jdk/nashorn/internal/objects/NativeError.java

*** 314,324 ****
--- 314,329 ----
          }
  
          final Object exception = ECMAException.getException(sobj);
          if (exception instanceof Throwable) {
              final Object value = getScriptStackString(sobj, (Throwable)exception);
+             if (sobj.hasOwnProperty(STACK)) {
                  sobj.put(STACK, value, false);
+             } else {
+                 sobj.addOwnProperty(STACK, Attribute.NOT_ENUMERABLE, value);
+             }
+ 
              return value;
          }
  
          return UNDEFINED;
      }
*** 332,342 ****
       *
       * @return value that was set
       */
      public static Object setStack(final Object self, final Object value) {
          final ScriptObject sobj = Global.checkObject(self);
!         sobj.set(STACK, value, false);
          return value;
      }
  
      /**
       * ECMA 15.11.4.4 Error.prototype.toString ( )
--- 337,351 ----
       *
       * @return value that was set
       */
      public static Object setStack(final Object self, final Object value) {
          final ScriptObject sobj = Global.checkObject(self);
!         if (sobj.hasOwnProperty(STACK)) {
!             sobj.put(STACK, value, false);
!         } else {
!             sobj.addOwnProperty(STACK, Attribute.NOT_ENUMERABLE, value);
!         }
          return value;
      }
  
      /**
       * ECMA 15.11.4.4 Error.prototype.toString ( )