--- a/Helpviewer/AdBlock/AdBlockIcon.py	Fri Mar 18 19:16:33 2016 +0100
+++ b/Helpviewer/AdBlock/AdBlockIcon.py	Sat Mar 19 14:39:33 2016 +0100
@@ -163,6 +163,9 @@
         @return flag indicating an exception (boolean)
         """
         browser = self.__mw.currentBrowser()
+        if browser is None:
+            return False
+        
         urlHost = browser.page().url().host()
         
         import Helpviewer.HelpWindow