Have a translator who is working with an Articulate Storyline XLF file.  He will confirm a segment and it goes to the next unconfirmed.  Goes to confirm and system closes down.  Did pop up that "Object reference not set to an instance of an object" generic error code.

Reset Trados and updated settings.   Tried confirming segments twice and seems to have solved that issue, but decided to run Verify to see if that still caused issue.   Same problem. Shuts down and same error message pops up.

Any idea why this would be happening.

Using Studio 17.2.11.19134 with Windows 11 Enterprise.

Here is screenshot of error logfile:

<SDLErrorDetails time="8/14/2025 10:54:12 AM">
  <ErrorMessage>Object reference not set to an instance of an object.</ErrorMessage>
  <Exception>
    <Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <HelpLink />
    <Source>Sdl.Verification.TermVerifier</Source>
    <HResult>-2147467261</HResult>
    <StackTrace><![CDATA[   at Sdl.Verification.TermVerifier.TermVerifierProcessing.HasTargetEntry(ITermRecognitionHit sourceHit, List`1 targetTermsNotMatched)
   at Sdl.Verification.TermVerifier.TermVerifierProcessing.CheckTermUsage()
   at Sdl.Verification.TermVerifier.TermVerifierProcessing.Verify(ISegment source, ISegment target, Boolean sourceHasRevisions, Boolean targetHasRevisions)
   at Sdl.Verification.TermVerifier.TermVerifierMain.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.Core.Utilities.BilingualApi.BilingualContentHandlerAdapter.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.Core.Utilities.BilingualApi.BilingualContentHandlerAdapter.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.Core.Utilities.BilingualApi.BilingualContentHandlerAdapter.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.Integration.AbstractBilingualProcessorContainer.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.Integration.LocationMarkerLocator.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.Integration.AbstractBilingualProcessorContainer.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.FileTypeSupport.Framework.Integration.FileExtractor.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   at Sdl.TranslationStudio.Editor.TranslationEditor.SingleParagraphUnitBilingualParser.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.SegmentVerifier.Verify(ISegmentContainerNode segmentContainerNode, IParagraphUnitContainerNode paragraphContainerNode, IFileContainerNode fileContainerNode)
   at Sdl.TranslationStudio.Editor.TranslationEditor.TranslatableDocument.VerifySegment(ISegmentContainerNode segmentContainerNode, IParagraphUnitContainerNode paragraphContainerNode, IFileContainerNode fileContainerNode)
   at Sdl.TranslationStudio.Editor.TranslationEditor.SideBySideDocumentEditingView.VerifySegment()
   at Sdl.TranslationStudio.Editor.TranslationEditor.Actions.AbstractConfirmSegmentAction.ExecuteActiveSegment(SideBySideDocumentEditingView editingView, ParagraphUnitId paragraphId, SegmentId segmentId)
   at Sdl.TranslationStudio.Editor.TranslationEditor.Actions.AbstractConfirmSegmentAction.Execute()
   at Sdl.Desktop.Platform.Implementation.CommandBars.SimpleActionExecuter.Execute(ActionData actionData)
   at Sdl.Desktop.Platform.Implementation.ResourceLoggingInternalCommandExecuter`1.ExecuteWithResourceLogging(TCommandData commandData, String message)
   at Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.ExecuteAction(IAction action, ActionOrigin origin, Boolean allowToggle)
   at Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.ExecuteActionForShortcut(Keys shortcut)
   at Sdl.Platform.UI.StudioWindowForm.OnPreviewKeyDown(Keys keys)
   at Sdl.Platform.UI.GlobalKeysMessageFilter.PreFilterMessage(Message& m)
   at System.Windows.Forms.Application.ThreadContext.ProcessFilters(MSG& msg, Boolean& modified)
   at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)
   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FPreTranslateMessage(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at Sdl.TranslationStudio.Application.Launcher.RunApplication()]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>Trados Studio</ProductName>
    <ProductVersion>Studio17</ProductVersion>
    <EntryAssemblyFileVersion>17.2.11.19134</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 11 Enterprise</OperatingSystem>