Error message: An item with the same key has already been added

I have started getting the error message "An item with the same key has already been added" (in Multiterm2017) when I try to open merged entries.

The errorfile is attached.

<SDLErrorDetails time="04.08.2017 19:51:30">
  <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 Sdl.MultiTerm.TMO.Interop.EntryContentClass.get_Fields()
   at Sdl.MultiTerm.Client.UI.HitList.FieldHandler.GetEntryLevelFields(XmlDocument permissions, IEntry entry, String termbaseName, Boolean compact)
   at Sdl.MultiTerm.Client.UI.HitList.HitList.AddTermFields(HitListNode node, ITermbase termbase, ITermHit hit, IEntry entry)
   at Sdl.MultiTerm.Client.UI.HitList.HitList.FillTreeParallel()
   at Sdl.MultiTerm.Client.UI.HitList.HitList.RefreshTree()
   at Sdl.MultiTerm.Client.UI.HitList.HitList.AddHits(List`1 hits)
   at Sdl.MultiTerm.Studio.Editor.ViewParts.HitlistViewPart.AddHitsToList(List`1 hits)
   at Sdl.MultiTerm.Studio.Editor.ViewParts.HitlistViewPart._TermbaseService_SearchFinished(List`1 hits, Int32 pass)
   at Sdl.MultiTerm.Studio.Common.Interfaces.SearchFinishedHandler.Invoke(List`1 hits, Int32 pass)
   at Sdl.MultiTerm.Studio.Editor.TermbaseService.Search(String pattern)
   at Sdl.MultiTerm.Studio.Editor.Ribbons.SearchRibbon._SearchPatterns_KeyDown(Object sender, KeyEventArgs e)
   at Sdl.Desktop.Platform.WinForms.IgCommandBarComboBox.OnToolKeyDown(Object sender, ToolKeyEventArgs e)
   at Infragistics.Win.UltraWinToolbars.ToolKeyEventHandler.Invoke(Object sender, ToolKeyEventArgs e)
   at Infragistics.Win.UltraWinToolbars.ToolBase.OnToolKeyDown(ToolKeyEventArgs e)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.OnToolKeyDown(ToolKeyEventArgs e)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.FireEvent(ToolbarEventIds id, EventArgs e)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.OnEditor_KeyDown(Object sender, KeyEventArgs e)
   at Infragistics.Win.EmbeddableEditorBase.RaiseKeyDownEvent(KeyEventArgs e)
   at Infragistics.Win.EmbeddableTextBox.OnKeyDown(KeyEventArgs e)
   at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
   at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
   at Infragistics.Win.EmbeddableTextBoxWithUIPermissions.ProcessKeyMessage(Message& msg)
   at System.Windows.Forms.Control.WmKeyChar(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.TextBoxBase.WndProc(Message& m)
   at System.Windows.Forms.TextBox.WndProc(Message& m)
   at Infragistics.Win.EmbeddableTextBoxWithUIPermissions.WndProcInternal(Message& m)
   at Infragistics.Win.EmbeddableTextBoxWithUIPermissions.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 MultiTerm</ProductName>
    <ProductVersion>MultiTerm14</ProductVersion>
    <EntryAssemblyFileVersion>14.1.2441.0</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1043</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>CHRISTINE\PC</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>CHRISTINE</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8270708 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

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