Bug fix:

Issue shows that document does not contain 'r' xml element on the line which starts with 'tab'. This causes exception in processing.
The line is enclosed in the 'pPr' element though.

Fix by MiroJanosik

DocX/Paragraph.cs

@@ -1694,7 +1694,7 @@ namespace Novacode
                 count -= HelperFunctions.GetSize(Xml);
 
                 // We have found the element, now find the run it belongs to.
-                while (Xml.Name.LocalName != "r")
+                while ((Xml.Name.LocalName != "r") && (Xml.Name.LocalName != "pPr"))
                     Xml = Xml.Parent;
 
                 theOne = new Run(Document, Xml, count);