--- a/Plugins/PluginPep8Checker.py	Sun Mar 20 18:18:12 2011 +0100
+++ b/Plugins/PluginPep8Checker.py	Mon Mar 21 20:03:13 2011 +0100
@@ -266,7 +266,7 @@
         """
         editor = e5App().getObject("ViewManager").activeWindow()
         if editor is not None:
-            if editor.checkDirty():
+            if editor.checkDirty() and editor.getFileName() is not None:
                 self.__editorPep8CheckerDialog = Pep8Dialog()
                 self.__editorPep8CheckerDialog.show()
                 self.__editorPep8CheckerDialog.start(