--- a/Helpviewer/AdBlock/AdBlockBlockedNetworkReply.py	Thu Mar 21 19:26:10 2019 +0100
+++ b/Helpviewer/AdBlock/AdBlockBlockedNetworkReply.py	Thu Mar 21 19:27:42 2019 +0100
@@ -52,7 +52,7 @@
         @param maxlen maximum number of bytes to read (integer)
         @return string containing the data (string)
         """
-        return None
+        return ""
     
     def abort(self):
         """