Error message "An item with the same key has already been added" as soon as I merged two segments

Hello!

 

I started working on a project this morning, which seemed to be going fine until i merged two segment. Now i'm unable to confirm the segment with the new translation. I'd already confirmed one of the segments that I merged. 

Is there a way around this? Thanks!

<SDLErrorDetails time="9/21/2017 2:21:24 PM">
  <ErrorMessage>An item with the same key has already been added.</ErrorMessage>
  <Exception>
    <Type>System.ArgumentException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <ParamName />
    <HelpLink />
    <Source>mscorlib</Source>
    <HResult>-2147024809</HResult>
    <StackTrace><![CDATA[   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Sdl.FileTypeSupport.Framework.Native.AbstractMetaDataContainer.ReplaceMetaDataWithCloneOf(IEnumerable`1 toClone)
   at Sdl.FileTypeSupport.Framework.Native.AbstractMetaDataContainer..ctor(AbstractMetaDataContainer other)
   at Sdl.FileTypeSupport.Framework.Native.TranslationOrigin.Clone()
   at Sdl.FileTypeSupport.Framework.Native.SegmentPairProperties..ctor(SegmentPairProperties other)
   at Sdl.FileTypeSupport.Framework.Native.SegmentPairProperties.Clone()
   at Sdl.TranslationStudio.Editor.TranslationEditor.TranslatableDocument.SetSegmentConfirmationLevel(ISegmentContainerNode segmentNode, ConfirmationLevel newConfirmationLevel)
   at Sdl.TranslationStudio.Editor.TranslationEditor.SideBySideDocumentEditingView.ConfirmSegment(Nullable`1 segmentNavigationFilter)
   at Sdl.TranslationStudio.Editor.TranslationEditor.Actions.AbstractConfirmSegmentAction.ExecuteActiveSegment()
   at Sdl.TranslationStudio.Editor.TranslationEditor.Actions.AbstractConfirmSegmentAction.Execute()
   at Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.<>c__DisplayClass3.<ExecuteAction>b__2()
   at Sdl.Desktop.Platform.Implementation.Services.Log.Resources(Object message, Action action)
   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.Desktop.Platform.WinForms.StudioWindowForm.OnKeyDown(KeyEventArgs e)
   at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
   at System.Windows.Forms.Form.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
   at System.Windows.Forms.Control.WmKeyChar(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>12.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>12.3.5281.10</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Entreprise</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1036</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>TALENTSOFT\snarayan</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>LP-FFNM262</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8274268 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

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