Help with custom battle system fix [RESOLVED]

Hi all,

I have had a battle system written for me but there is a game crashing bug which I'm trying to fix.

I get a TypeError, cannot read property 'setItem' of undefined, when I try to use an item after an actor has been revived, if they haven't been revived it all works fine but as soon as they do that's when I get the issue. This bit of code seems to be the problem

   Scene_Battle.prototype.onItemOk = function() {
       var item = this._itemWindow.item();
       var action = BattleManager.inputtingAction();
       action.setItem(item.id);
       $gameParty.setLastItem(item);
       this.onSelectAction();
   };

Does anyone have any ideas to point me in the right direction with this?

Thanks in advance

EDIT: I've put this up in commercial request for a fix if anyone is interested in helping for a fee