Some text (Invalid HTML mistaken for HTML) causes exceptions

[wcfv]

 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 MarkdownDeep.HtmlTag.ParseHelper(StringScanner p) in Z:\markdowndeep\MarkdownDeep\HtmlTag.cs:line 343

[wcfv]

Example:

Markdown.Transform("<foo bar bar>")

[pkuma-msft]

A markdown containing the following text also throws the same exception, (using version 1.5)

## My heading
<svg width="80px" height="77px" viewBox="0 0 80 77" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sketch="http://www.bohemiancoding.com/sketch/ns">
    <defs></defs>
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" sketch:type="MSPage">
        <g id="A12_PDF_90x90" sketch:type="MSLayerGroup" transform="translate(-1.000000, 0.000000)" fill="#D40000">
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<script type="text/javascript"><![CDATA[
    function malsvgsvg(){
		alert(document.cookie);
		console.log('hellofromconsole');
		return 0;
    }

    window["myvarpkuma"] = malsvgsvg();
  ]]></script>    
</svg>