Исключение с использованием кнопки слияния в Team Explorer в Visual Studio Professional 2015

Я получаю исключение, когда я нажимаю кнопку слияния в командном проводнике в Visual Studio Professional 2015.

An exception has been encountered. This may be caused by an extension.
You can get more information by examining the file C:\Users\XXXX\AppData\Roaming\Microsoft\VisualStudio\14.0\ActivityLog.xml'.

Содержимое ActivityLog.xml выглядит следующим образом:

<record>775</record>
<time>2016/02/23 11:22:08.722</time>
<type>Error</type>
<source>Editor or Editor Extension</source>
<description>
    System.ArgumentNullException: Value cannot be null.&#x000D;&#x000A;Parameter name: key&#x000D;&#x000A;
    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)&#x000D;&#x000A;
    at Microsoft.VisualStudio.Html.Package.Extensions.ExtensionsManager.OnTextViewCreated(ITextView textView, ITextBuffer textBuffer)&#x000D;&#x000A;
    at Microsoft.Web.Editor.Controller.TextViewConnectionListener.OnTextViewGotAggregateFocus(ITextView textView, ITextBuffer textBuffer)&#x000D;&#x000A;
    at Microsoft.VisualStudio.Html.Package.Commands.Html.VsHtmlTextViewConnectionListener.OnTextViewGotAggregateFocus(ITextView textView, ITextBuffer textBuffer)&#x000D;&#x000A;
    at Microsoft.Web.Editor.Controller.TextViewConnectionListener.&lt;&gt;c__DisplayClass24_0.&lt;OnTextViewConnected&gt;b__0(Object sender, EventArgs eventArgs)&#x000D;&#x000A;
    at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.RaiseEvent(Object sender, EventHandler eventHandlers)
</description>