SDL Trados Studio 2017 error message when creating a project with .docx files : Object reference not set to an instance of an object!

Hi,

I am getting the error message "object reference not set to an instance of an object" whenever I try to create a project with certain .docx files (it does not happen with all .docx files).

Can anyone suggest a solution please?

<?xml version="1.0"?>
-<SDLErrorDetails time="19/10/2017 09:35:11">
<ErrorMessage>Riferimento a un oggetto non impostato su un'istanza di oggetto.</ErrorMessage>
-<Exception>
<Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
<HelpLink/>
<Source>Sdl.FileTypeSupport.Filters.MicrosoftOffice.Word_2</Source>
<HResult>-2147467261</HResult>
-<StackTrace>
-<![CDATA[ in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Word.Services.ContextInformationService.ProcessContextAndStructureInformationForParagraphStyles(String name)
in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Word.Consumers.Parser.ContextInformation.ParagraphStylesContextInformationConsumer.Consume(Entity entity)
in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Word.Routes.Parser.ContextInformationRoute.Handle(Entity entity)
in lambda_method(Closure , IMessage )
in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Core.Infrastructure.Dispatcher.Publish(IMessage message)
in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Core.Services.ParserService.Publish(Entity parsedEntity)
in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Core.Services.ParserService.Parse()
in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Core.Parser.DocumentParser.Parse()
in Sdl.FileTypeSupport.Filters.MicrosoftOffice.Word.Parser.DocxParser.ParseNext()
in Sdl.FileTypeSupport.Framework.Integration.FileExtractor.ParseNext()
in Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.ParseNext()
in Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.Parse()
in Sdl.ProjectApi.AutomaticTasks.Conversion.ConversionTask.ProcessFile(IExecutingTaskFile executingTaskFile)
in Sdl.ProjectApi.AutomaticTasks.AbstractFileLevelAutomaticTaskImplementation.Execute()]]>
</StackTrace>
</Exception>
-<Environment>
<ProductName>SDL Trados Studio</ProductName>
<ProductVersion>14.0.0.0</ProductVersion>
<EntryAssemblyFileVersion>14.1.6329.7</EntryAssemblyFileVersion>
<OperatingSystem>Microsoft Windows 10 Home</OperatingSystem>
<ServicePack>NULL</ServicePack>
<OperatingSystemLanguage>1040</OperatingSystemLanguage>
<CodePage>1252</CodePage>
<LoggedOnUser>DESKTOP-9AV9UIO\Jacques Friggieri</LoggedOnUser>
<DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
<ComputerName>DESKTOP-9AV9UIO</ComputerName>
<ConnectedToNetwork>True</ConnectedToNetwork>
<PhysicalMemory>12491632 MB</PhysicalMemory>
</Environment>
</SDLErrorDetails>