lib/sanitize.rb in sanitize-3.1.0 vs lib/sanitize.rb in sanitize-3.1.1

@@ -168,10 +168,10 @@
 
   private
 
   # Preprocesses HTML before parsing to remove undesirable Unicode chars.
   def preprocess(html)
-    html.to_s.dup
+    html = html.to_s.dup
 
     unless html.encoding.name == 'UTF-8'
       html.encode!('UTF-8',
         :invalid => :replace,
         :undef   => :replace)