Value cannot be null. Parameter name: key

[bovender]

This issue was submitted by the add-in's exception handler.

Exception:

System.ArgumentNullException: Value cannot be null.
Parameter name: key
   at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at XLToolbox.WorkbookStorage.Store.ReadFromWorksheet() in X:\Code\xltoolbox\NG\XLToolbox\WorkbookStorage\Store.cs:line 475
   at XLToolbox.WorkbookStorage.Store..ctor(Workbook workbook) in X:\Code\xltoolbox\NG\XLToolbox\WorkbookStorage\Store.cs:line 205
   at XLToolbox.Export.Models.BatchExportSettings.FromLastUsed(Workbook workbookContext) in X:\Code\xltoolbox\NG\XLToolbox\Export\Models\BatchExportSettings.cs:line 60
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.FromLastUsed(Workbook workbookContext) in X:\Code\xltoolbox\NG\XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 68
   at XLToolbox.Dispatcher.BatchExport() in X:\Code\xltoolbox\NG\XLToolbox\Dispatcher.cs:line 226
   at XLToolbox.Dispatcher.Execute(Command cmd) in X:\Code\xltoolbox\NG\XLToolbox\Dispatcher.cs:line 64

Message: Value cannot be null.
Parameter name: key

Environment

Parameter	Value
Version	7.3.4
OS	Microsoft Windows NT 10.0.18363.0, 64-bit
Excel	365 (16.0.11929), 64-bit
CLR	4.0.30319.42000, 64-bit
VSTO runtime	10.0.60828
ClickOnce	False
Bovender	0.18.0.0
FreeImage	3.18.0
Identifier	101f4ba52deb18f0d4f065889e9cf955e98a0043bf66ae3a30ea9926475c0a8b