Failed to save target content: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

I received this error message in Studio 2017 (latest updates installed) under Win 7, when saving a (fairly complex) Excel file as target. I've worked with previous versions of this file in the past and they did have their quirks, but this time I'm completely clueless. Here's the stack trace plus some related information of the error message:

<

<Exception>
  <Type>System.ArgumentOutOfRangeException, mscorlib, Version=4.0.0.0,
  Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
  <ParamName>index</ParamName>
  <HelpLink />
  <Source>mscorlib</Source>
  <HResult>-2146233086</HResult>
  <StackTrace>
    <![CDATA[ at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource) at System.Collections.Generic.List`1.get_Item(Int32 index) at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Comments.AuthorsBuilder.ExtractCommentFromOriginalComments(String commentFile, CellReference commentCellReference) at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Comments.AuthorsBuilder.BuildAuthors(String commentFile, IEnumerable`1 sortedAllCommentsCellReferences) at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Comments.CommentsWriter.WriteAuthors(MarkupWriter markupWriter, String commentFile, IEnumerable`1 sortedAllCommentsCellReferences) at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Comments.CommentsWriter.WriteTargetCommentFile(String commentFile, String targetFilePath) at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Comments.CommentsWriter.WriteTargetCommentsFiles() at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Comments.CommentsWriter.Execute() at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Archive.ArchiveWriter.WriteArchiveParts() at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.Writer.Archive.ArchiveWriter.Process(WriterInformation writerInformation) at Sdl.FileTypeSupport.Filters.MicrosoftOffice.Excel.XlsxWriter.FileComplete() at Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.FileComplete() at Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.FileComplete() at Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.FileComplete() at Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.FileComplete() at Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.FileComplete() at Sdl.FileTypeSupport.Framework.Integration.AbstractBilingualProcessorContainer.FileComplete() at Sdl.FileTypeSupport.Framework.Integration.FileGenerator.FileComplete() at Sdl.FileTypeSupport.Framework.Integration.AbstractBilingualProcessorContainer.FileComplete() at Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.FileComplete() at Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.FileComplete() at Sdl.FileTypeSupport.Framework.Integration.AbstractBilingualProcessorContainer.FileComplete() at Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReaderImpl.vv_Visit(TmfcReaderImpl* , FrameworkFileContainerField* field) at FrameworkFileContainerField.vv_AcceptFrameworkVisitor(FrameworkFileContainerField* , FrameworkFieldVisitor* visitor) at Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReaderImpl.vv_VisitStartEndField(TmfcReaderImpl* , StartEndField* startEnd) at Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReaderImpl.b_VisitNext(TmfcReaderImpl* ) at Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReader.ParseNext() at Sdl.FileTypeSupport.Framework.Integration.FileExtractor.ParseNext() at Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.ParseNext() at Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.Parse() at Sdl.TranslationStudio.Editor.TranslationEditor.TranslatableDocument.SaveMonolingualAsJobRequest.Execute(IJobExecutionContext context) at Sdl.Desktop.Platform.Implementation.Services.Job.<_worker_DoWork>b__3() at Sdl.Desktop.Platform.Implementation.Services.Log.Resources(Object message, Action action) at Sdl.Desktop.Platform.Implementation.Services.Job._worker_DoWork(Object sender, DoWorkEventArgs e) at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e) at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)]]>
</StackTrace>
</Exception>
<Environment>
  <ProductName>SDL Trados Studio</ProductName>
  <ProductVersion>14.0.0.0</ProductVersion>
  <EntryAssemblyFileVersion>14.1.6413.8</EntryAssemblyFileVersion>
  <OperatingSystem>Microsoft Windows 7 Professional</OperatingSystem>
  <ServicePack>Service Pack 1</ServicePack>
  <OperatingSystemLanguage>1031</OperatingSystemLanguage>
  <CodePage>1252</CodePage>
</Environment>

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