ArgumentException when modifying a page while taste is running #296

System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector)
   at Pretzel.Logic.Templating.Razor.ExtensibleProxy`1..ctor(IEnumerable`1 extensibleMethods)
   at Pretzel.Logic.Templating.Razor.ExtensibleActivator..ctor(IActivator defaultActivator, IEnumerable`1 filters, IEnumerable`1 tags)
   at Pretzel.Logic.Templating.Razor.RazorSiteEngine.RenderTemplate(String content, PageContext pageData)
   at Pretzel.Logic.Templating.JekyllEngineBase.ProcessFile(String outputDirectory, Page page, Page previous, Page next, Boolean skipFileOnError, String relativePath)
Failed to process C:\Users\hartez\Documents\Bitbucket\alumnihome\newsite\_site\about.html: System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector)
   at Pretzel.Logic.Templating.Razor.ExtensibleProxy`1..ctor(IEnumerable`1 extensibleMethods)
   at Pretzel.Logic.Templating.Razor.ExtensibleActivator..ctor(IActivator defaultActivator, IEnumerable`1 filters, IEnumerable`1 tags)
   at Pretzel.Logic.Templating.Razor.RazorSiteEngine.RenderTemplate(String content, PageContext pageData)
   at Pretzel.Logic.Templating.JekyllEngineBase.ProcessFile(String outputDirectory, Page page, Page previous, Page next, Boolean skipFileOnError, String relativePath)