When saving target file (Trados Studio 2017 with latest service pack installed), I get an error: "Failed to save target content: Index must be within the bounds of the list. Paramter name: index. Original XLIFF & error attached

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<SDLErrorDetails time="4/25/2018 10:24:16 AM">
<ErrorMessage>Failed to save target content: The SpanningCodeStart must have Isolated set to true because there are no SpanningCodeEnd elements that reference the element.</ErrorMessage>
<Exception>
<Type>Localization.Xliff.OM.Exceptions.ValidationException, Xliff.OM, Version=1.1.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
<ErrorNumber>20106</ErrorNumber>
<SelectorPath>#/f=c632700e-7ea8-4fcd-bfe8-6d4dc5a1d5f6/g=56efe369-f7e2-41eb-8db2-68e2a70c1fba/u=605d9f1c-0056-4f78-a0db-515ef8af8b87/t=1</SelectorPath>
<HelpLink />
<Source>Xliff.OM</Source>
<HResult>-2146233088</HResult>
<StackTrace><![CDATA[ at Localization.Xliff.OM.Validators.StandardValidator.ValidateIsolated(List`1 list)
at Localization.Xliff.OM.Validators.StandardValidator.ValidateUnit(Unit unit)
at Localization.Xliff.OM.Validators.StandardValidator.ValidateTranslationContainer(TranslationContainer container)
at Localization.Xliff.OM.Validators.StandardValidator.ValidateGroup(Group group)
at Localization.Xliff.OM.Validators.StandardValidator.ValidateTranslationContainer(TranslationContainer container)
at Localization.Xliff.OM.Validators.StandardValidator.ValidateFile(File file)
at Localization.Xliff.OM.Validators.StandardValidator.ValidateImpl()
at Localization.Xliff.OM.Validators.StandardValidator.Validate(XliffDocument document)
at Sdl.FileTypeSupport.Filters.Xliff2.Services.XliffFileService.Validate(XliffDocument xliffDocument)
at Sdl.FileTypeSupport.Filters.Xliff2.Services.XliffFileService.Write(XliffDocument xliffDocument, String filePath)
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