销售价目表审批流过程中查看明细增加的“导出”按钮报错

销售价目表审批流过程中查看明细增加的“导出”按钮报错
Sequence contains no elements
[{"operation":"BOS_EntityExport.ButtonClick"}]
发生时间：10:50:22
错误来源： System.Core
错误信息：Sequence contains no elements
===================================================
调用堆栈：
at System.Linq.Enumerable.Max(IEnumerable`1 source)
at Kingdee.BOS.ExcelToolHelper.ExcelHelper.FillMergeHeaders(List`1 columnNames, Int32 rowIndex)
at Kingdee.BOS.Business.Bill.Operation.EntityExport.ExportEntityData(ExcelOperation helper, List`1 headers, List`1 dataSource, String entityKey, List`1 result)
at Kingdee.BOS.Business.Bill.Operation.EntityExport.ReadyToExport(BeforeEntityExportArgs e)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.DoCallBackAction(Object returnData, Action`1 action)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.FormClosedCallBack(String id, Boolean isSyncCall)
at Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.CloseWindow()
at Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.OnClose()
at Kingdee.BOS.Web.Bill.BillView.b__94(MessageBoxResult result)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.ConfirmSaveIfExit(Action`1 action)
at Kingdee.BOS.Web.Bill.BillView.OnClose()
at Kingdee.BOS.Core.DynamicForm.PlugIn.DynamicFormViewPlugInProxy.FireAfterButtonClick(AfterButtonClickEventArgs e)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.ButtonClick(String key, String menuKey)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormController.ButtonClick(String buttonKey, String menuKey, JSONArray postDatas)
错误数据： System.Collections.ListDictionaryInternal

请问如何判断处理？