--- a/Plugins/CheckerPlugins/Pep8/Pep8NamingChecker.py	Tue Oct 01 18:20:46 2013 +0200
+++ b/Plugins/CheckerPlugins/Pep8/Pep8NamingChecker.py	Tue Oct 01 18:21:30 2013 +0200
@@ -111,7 +111,7 @@
         @return tuple giving line number, offset within line, code and
             checker function
         """
-        if self.__tree:
+        if self.__tree and self.__checkers:
             return self.__visitTree(self.__tree)
         else:
             return ()