保存（OnItemUpdating事件）ListView中的第一个编辑项时，为什么会出现空对象引用错误？

I'm getting the error "Object reference not set to an instance of an object." when trying to reference a HiddenField (lvEditProjectSteps_hdnStepStatusId for future reference) from the EditItem during the OnItemUpdating event after the Update event fires in a ListView. This only occurs on the FIRST item in the ListView. I checked the source and the HTML is being rendered properly.I'm getting the error "Object reference not set