树形维护保存出错

[{"operation":"ENG_BOMTREE.MBIClick.tbSplitSave"}]
发生时间：10:47:40
错误来源： Kingdee.BOS.ServiceHelper
错误信息：Object reference not set to an instance of an object.
===================================================
调用堆栈：

Server stack trace:
at Kingdee.BOS.App.Core.FlexSaveService.SaveFlexObjects(Dictionary`2 dictFlexDatas)
at Kingdee.BOS.App.Core.FlexSaveService.BatchSaveFlexObject(BusinessInfo info, Dictionary`2 dictFlexEntitys, DynamicObject[] dataEntities)
at Kingdee.BOS.App.Core.FlexSaveService.SaveFlexFixedColumn(BusinessInfo info, DynamicObject[] dataEntities)
at Kingdee.BOS.App.Core.SaveService.Save(Context ctx, BusinessInfo info, DynamicObject[] dataEntities, OperateOption option, String operationNumber)

Exception rethrown at [0]:
at Kingdee.BOS.ServiceHelper.BusinessDataServiceHelper.Save(Context ctx, BusinessInfo businessInfo, DynamicObject dataObject, OperateOption option, String operationNumber)
at Kingdee.BOS.Model.Bill.BillModel.Save(OperateOption option)
at Kingdee.BOS.Business.Bill.Operation.Save.ExecuteBillOperation(OperateOption option)
at Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormOperation.Operation(CallBackWfAfterOperation callbackwf, IOperationResult result)
at Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormOperation.Execute(InvokeFormOperation4WfParam param, CallBackWfAfterOperation callbackwf)
at Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.InvokeFormOperation(String operationNumber)
at Kingdee.K3.MFG.ENG.Business.PlugIn.DynamicForm.BomTree.DoChildOper(String barItemKey)
at Kingdee.K3.MFG.ENG.Business.PlugIn.DynamicForm.BomTree.BarItemClick(BarItemClickEventArgs e)
at Kingdee.BOS.Core.DynamicForm.PlugIn.DynamicFormViewPlugInProxy.FireBarItemClick(BarItemClickEventArgs e)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.BarItemClick(String parentKey, String barItemKey, BarDataManager bar, Int32 bartype)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.MainBarItemClick(String barItemKey)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormController.MainBarItemClick(String itemKey, JSONArray postDatas)
错误数据： System.Collections.ListDictionaryInternal