I received an "Object reference not set to an instance of an object" error message from the Worksheet_Calculate and Workbook_Calculate actions.

I received this error from the Worksheet_Calculate action when calculating a specific sheet (see attachment) and received the error from Workbook_Calculate when the beforementioned sheet was in the workbook.

Below are the accompanying error logs. Could you help me find out what could have caused the issue? 

Stack

Object reference not set to an instance of an object.

   at OfficeOpenXml.FormulaParsing.DependencyChainFactory.FollowChain(DependencyChain depChain, ILexer lexer, ExcelWorkbook wb, ExcelWorksheet ws, FormulaCell f, ExcelCalculationOption options)

   at OfficeOpenXml.FormulaParsing.DependencyChainFactory.GetChain(DependencyChain depChain, ILexer lexer, ExcelNamedRange name, ExcelCalculationOption options)

   at OfficeOpenXml.FormulaParsing.DependencyChainFactory.GetWorksheetNames(ExcelWorksheet ws, DependencyChain depChain, ExcelCalculationOption options)

   at OfficeOpenXml.FormulaParsing.DependencyChainFactory.Create(ExcelWorksheet ws, ExcelCalculationOption options)

   at OfficeOpenXml.CalculationExtension.Calculate(ExcelWorksheet worksheet, ExcelCalculationOption options)

   at OutSystems.NssAdvanced_Excel.CssAdvanced_Excel.MssWorksheet_Calculate(Object ssWorksheet)

   at ss[module name].RssExtensionAdvanced_Excel.MssWorksheet_Calculate(HeContext heContext, Object inParamWorksheet)

Stack

Object reference not set to an instance of an object.

   at ss[module name].RssExtensionAdvanced_Excel.MssWorksheet_Calculate(HeContext heContext, Object inParamWorksheet)

   at ss[module name].Actions.ActionCalculate_Workbook(HeContext heContext, Object inParamWorkbook)

   at ss[module name].Actions.ActionCalculate_Machine_Forwards(HeContext heContext, Int64 inParamLineSetupMachineId, String inParamIn_Capacity, RLout_CapacityList inParamProductInput, RLout_WarningsList& outParamout_Warnings, RLout_InformationList& outParamout_Information, RLout_CapacityList& outParamout_ProductOutput, RLout_MachineOutputList& outParamout_MachineOutput, RLout_CapacityList& outParamout_CapacityInput, String& outParamOut_Capacity, RLout_CapacityList& outParamout_ProductInput, RLout_CapacityList& outParamout_MachineInput, String& outParamOut_ProductSpeed, Byte[]& outParamOut_Checkfile)

   at ss[module name].Actions.ActionCalculate_LineSetup(HeContext heContext, Int64 inParamLineSetupId, RLMachineOutputList& outParamLineSetupOutput, RLout_CapacityList& outParamProductInput, Byte[]& outParamOut_Checkfile)

   at ss[module name].RsseSpace[module name].MssCalculate_LineSetup(HeContext heContext, Int64 inParamLineSetupId, RecordList& outParamLineSetupOutput, RecordList& outParamProductInput, Byte[]& outParamOut_Checkfile)

   at ss[module name].Actions.ActionCalculate_LineSetup(HeContext heContext, Int64 inParamLineSetupId, RLMachineOutputList& outParamLineSetupOutput, RLout_CapacityList& outParamProductInput, Byte[]& outParamOut_Checkfile)

   at ss[module name].ScreenServices[module name]_WebBlocks_WB_LineSetup_Detail_Controller.b__1b(HeContext heContext, String screenName, JObject screenModel, JObject inputParameters, JObject clientVariables)

   at OutSystems.RESTService.Controllers.ScreenServicesApiController.endpoint(String input, String endpointName, String apiVersion, EndpointImplementationDelegate implementation)

Stack

Calculate_LineSetup

 System.NullReferenceException: Object reference not set to an instance of an object.

    at Object.s [as getException] (https://XXXXXXXXXXX/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:2:10241)

    at c.onSuccess (https://XXXXXXXXXXX/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:3:7232)

    at XMLHttpRequest. (https://XXXXXXXXXXX/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:3:2648)

Note: the references that are usually